Repository: omni-us/jsonargparse
Pull request #371 (2023-09-05 13:57:57)

better error message when subcommand is not given
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## What does this PR do?

Fix issue: https://github.com/Lightning-AI/lightning/issues/18446

If the parser is configured with subcommands (using `ArgumentParser.add_subcommands`), the `subcommand._subcommands_action` will create an `_ActionSubCommands` object. During `parse_args`, it calls `_parse_common`, which handles the subcommands through `_ActionSubCommands.handle_subcommands`. This function relies on `_ActionSubCommands.get_subcommands` to retrieve subcommand parsers.

Within `_ActionSubCommands.get_subcommands`, if no subcommand was provided, it will raise a KeyError.

To provide a more informative error message, I have added a check here. If this action is a subcommand action, it will raise a KeyError with an error message that reminds users of the available subcommands and prompts them to select one."

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## Before submitting

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- [x] Did you write **unit tests** such that there is 100% coverage on related code? (required for bug fixes and new features)
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[![0.0%](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/Duplications/3-16px.png '0.0%')](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371&metric=new_duplicated_lines_density&view=list) [0.0% Duplication](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371&metric=new_duplicated_lines_density&view=list)


codecov[bot]: ## [Codecov](https://app.codecov.io/gh/omni-us/jsonargparse/pull/371?src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=omni-us) Report
Patch coverage: **`83.33%`** and project coverage change: **`-0.04%`** :warning:
> Comparison is base [(`6ed515b`)](https://app.codecov.io/gh/omni-us/jsonargparse/commit/6ed515b78d281e10b0cdc4fa3e8ae006fa29ed66?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=omni-us) 100.00% compared to head [(`6d23cb4`)](https://app.codecov.io/gh/omni-us/jsonargparse/pull/371?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=omni-us) 99.96%.

<details><summary>Additional details and impacted files</summary>


```diff
@@             Coverage Diff             @@
##              main     #371      +/-   ##
===========================================
- Coverage   100.00%   99.96%   -0.04%     
===========================================
  Files           21       21              
  Lines         5720     5726       +6     
===========================================
+ Hits          5720     5724       +4     
- Misses           0        2       +2     
```

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| [Files Changed](https://app.codecov.io/gh/omni-us/jsonargparse/pull/371?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=omni-us) | Coverage Δ | |
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| [jsonargparse/\_actions.py](https://app.codecov.io/gh/omni-us/jsonargparse/pull/371?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=omni-us#diff-anNvbmFyZ3BhcnNlL19hY3Rpb25zLnB5) | `99.57% <83.33%> (-0.43%)` | :arrow_down: |


</details>

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[![Code Smell](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/code_smell-16px.png 'Code Smell')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL) [0 Code Smells](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL)

[![No Coverage information](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/CoverageChart/NoCoverageInfo-16px.png 'No Coverage information')](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371) No Coverage information  
[![0.0%](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/Duplications/3-16px.png '0.0%')](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371&metric=new_duplicated_lines_density&view=list) [0.0% Duplication](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371&metric=new_duplicated_lines_density&view=list)


sonarcloud[bot]: Kudos, SonarCloud Quality Gate passed!&nbsp; &nbsp; [![Quality Gate passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/passed-16px.png 'Quality Gate passed')](https://sonarcloud.io/dashboard?id=omni-us_jsonargparse&pullRequest=371)

[![Bug](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/bug-16px.png 'Bug')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG) [0 Bugs](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG)  
[![Vulnerability](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/vulnerability-16px.png 'Vulnerability')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY) [0 Vulnerabilities](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY)  
[![Security Hotspot](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/security_hotspot-16px.png 'Security Hotspot')](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT) [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT)  
[![Code Smell](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/code_smell-16px.png 'Code Smell')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL) [0 Code Smells](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL)

[![No Coverage information](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/CoverageChart/NoCoverageInfo-16px.png 'No Coverage information')](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371) No Coverage information  
[![0.0%](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/Duplications/3-16px.png '0.0%')](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371&metric=new_duplicated_lines_density&view=list) [0.0% Duplication](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371&metric=new_duplicated_lines_density&view=list)


sonarcloud[bot]: Kudos, SonarCloud Quality Gate passed!&nbsp; &nbsp; [![Quality Gate passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/passed-16px.png 'Quality Gate passed')](https://sonarcloud.io/dashboard?id=omni-us_jsonargparse&pullRequest=371)

[![Bug](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/bug-16px.png 'Bug')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG) [0 Bugs](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG)  
[![Vulnerability](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/vulnerability-16px.png 'Vulnerability')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY) [0 Vulnerabilities](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY)  
[![Security Hotspot](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/security_hotspot-16px.png 'Security Hotspot')](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT) [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT)  
[![Code Smell](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/code_smell-16px.png 'Code Smell')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL) [0 Code Smells](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL)

[![No Coverage information](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/CoverageChart/NoCoverageInfo-16px.png 'No Coverage information')](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371) No Coverage information  
[![0.0%](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/Duplications/3-16px.png '0.0%')](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371&metric=new_duplicated_lines_density&view=list) [0.0% Duplication](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371&metric=new_duplicated_lines_density&view=list)


sonarcloud[bot]: Kudos, SonarCloud Quality Gate passed!&nbsp; &nbsp; [![Quality Gate passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/passed-16px.png 'Quality Gate passed')](https://sonarcloud.io/dashboard?id=omni-us_jsonargparse&pullRequest=371)

[![Bug](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/bug-16px.png 'Bug')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG) [0 Bugs](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG)  
[![Vulnerability](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/vulnerability-16px.png 'Vulnerability')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY) [0 Vulnerabilities](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY)  
[![Security Hotspot](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/security_hotspot-16px.png 'Security Hotspot')](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT) [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT)  
[![Code Smell](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/code_smell-16px.png 'Code Smell')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL) [0 Code Smells](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL)

[![No Coverage information](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/CoverageChart/NoCoverageInfo-16px.png 'No Coverage information')](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371) No Coverage information  
[![0.0%](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/Duplications/3-16px.png '0.0%')](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371&metric=new_duplicated_lines_density&view=list) [0.0% Duplication](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371&metric=new_duplicated_lines_density&view=list)


sonarcloud[bot]: Kudos, SonarCloud Quality Gate passed!&nbsp; &nbsp; [![Quality Gate passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/passed-16px.png 'Quality Gate passed')](https://sonarcloud.io/dashboard?id=omni-us_jsonargparse&pullRequest=371)

[![Bug](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/bug-16px.png 'Bug')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG) [0 Bugs](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG)  
[![Vulnerability](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/vulnerability-16px.png 'Vulnerability')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY) [0 Vulnerabilities](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY)  
[![Security Hotspot](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/security_hotspot-16px.png 'Security Hotspot')](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT) [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT)  
[![Code Smell](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/code_smell-16px.png 'Code Smell')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL) [0 Code Smells](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL)

[![No Coverage information](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/CoverageChart/NoCoverageInfo-16px.png 'No Coverage information')](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371) No Coverage information  
[![0.0%](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/Duplications/3-16px.png '0.0%')](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371&metric=new_duplicated_lines_density&view=list) [0.0% Duplication](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371&metric=new_duplicated_lines_density&view=list)


sonarcloud[bot]: Kudos, SonarCloud Quality Gate passed!&nbsp; &nbsp; [![Quality Gate passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/passed-16px.png 'Quality Gate passed')](https://sonarcloud.io/dashboard?id=omni-us_jsonargparse&pullRequest=371)

[![Bug](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/bug-16px.png 'Bug')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG) [0 Bugs](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG)  
[![Vulnerability](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/vulnerability-16px.png 'Vulnerability')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY) [0 Vulnerabilities](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY)  
[![Security Hotspot](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/security_hotspot-16px.png 'Security Hotspot')](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT) [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT)  
[![Code Smell](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/code_smell-16px.png 'Code Smell')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL) [0 Code Smells](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL)

[![No Coverage information](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/CoverageChart/NoCoverageInfo-16px.png 'No Coverage information')](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371) No Coverage information  
[![0.0%](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/Duplications/3-16px.png '0.0%')](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371&metric=new_duplicated_lines_density&view=list) [0.0% Duplication](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371&metric=new_duplicated_lines_density&view=list)


sonarcloud[bot]: Kudos, SonarCloud Quality Gate passed!&nbsp; &nbsp; [![Quality Gate passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/passed-16px.png 'Quality Gate passed')](https://sonarcloud.io/dashboard?id=omni-us_jsonargparse&pullRequest=371)

[![Bug](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/bug-16px.png 'Bug')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG) [0 Bugs](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG)  
[![Vulnerability](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/vulnerability-16px.png 'Vulnerability')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY) [0 Vulnerabilities](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY)  
[![Security Hotspot](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/security_hotspot-16px.png 'Security Hotspot')](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT) [0 Security Hotspots](https://sonarcloud.io/project/security_hotspots?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=SECURITY_HOTSPOT)  
[![Code Smell](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/code_smell-16px.png 'Code Smell')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL) [0 Code Smells](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=CODE_SMELL)

[![No Coverage information](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/CoverageChart/NoCoverageInfo-16px.png 'No Coverage information')](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371) No Coverage information  
[![0.0%](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/Duplications/3-16px.png '0.0%')](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371&metric=new_duplicated_lines_density&view=list) [0.0% Duplication](https://sonarcloud.io/component_measures?id=omni-us_jsonargparse&pullRequest=371&metric=new_duplicated_lines_density&view=list)


sonarcloud[bot]: Kudos, SonarCloud Quality Gate passed!&nbsp; &nbsp; [![Quality Gate passed](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/QualityGateBadge/passed-16px.png 'Quality Gate passed')](https://sonarcloud.io/dashboard?id=omni-us_jsonargparse&pullRequest=371)

[![Bug](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/bug-16px.png 'Bug')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG) [0 Bugs](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=BUG)  
[![Vulnerability](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/common/vulnerability-16px.png 'Vulnerability')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY) [![A](https://sonarsource.github.io/sonarcloud-github-static-resources/v2/checks/RatingBadge/A-16px.png 'A')](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY) [0 Vulnerabilities](https://sonarcloud.io/project/issues?id=omni-us_jsonargparse&pullRequest=371&resolved=false&types=VULNERABILITY)  
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0x404: hi, @mauvilsa 
I currently add the missing test case which test `parse_args` from `sys.argv` in this pull request, hope it's fine :)
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Patch:
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 6729c11..67569dd 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -12,6 +12,16 @@ The semantic versioning only considers the public API as described in
 paths are considered internals and can change in minor and patch releases.
 
 
+v4.25.0 (2023-09-??)
+--------------------
+
+Changed
+^^^^^^^
+- Provide a more informative error message to remind user to select
+  and provide a subcommand when a subcommand is required but not
+  provided (`#371<https://github.com/omni-us/jsonargparse/pull/371>`__).
+
+
 v4.24.1 (2023-09-06)
 --------------------
 
diff --git a/jsonargparse/_actions.py b/jsonargparse/_actions.py
index 977f87b..4f4a1f1 100644
--- a/jsonargparse/_actions.py
+++ b/jsonargparse/_actions.py
@@ -699,7 +699,15 @@ class _ActionSubCommands(_SubParsersAction):
             if subcommand is None and not (fail_no_subcommand and action._required):  # type: ignore
                 return None, None
             if action._required and subcommand not in action._name_parser_map:  # type: ignore
-                raise KeyError(f'"{dest}" is required but not given or its value is None.')
+                # If subcommand is required and no subcommand is provided,
+                # present the user with a friendly error message to remind them of
+                # the available subcommands and to select one.
+                available_subcommands = list(action._name_parser_map.keys())
+                if len(available_subcommands) <= 5:
+                    candidate_subcommands_str = "{" + ",".join(available_subcommands) + "}"
+                else:
+                    candidate_subcommands_str = "{" + ",".join(available_subcommands[:5]) + ", ...}"
+                raise KeyError(f'expected "{dest}" to be one of {candidate_subcommands_str}, but it was not provided.')
 
         return subcommand_keys, [action._name_parser_map.get(s) for s in subcommand_keys]  # type: ignore
 


Test patch:
diff --git a/jsonargparse_tests/test_core.py b/jsonargparse_tests/test_core.py
index efd4df2..fea30eb 100644
--- a/jsonargparse_tests/test_core.py
+++ b/jsonargparse_tests/test_core.py
@@ -60,6 +60,12 @@ def test_parse_args_unrecognized_arguments(parser):
     assert "Unrecognized arguments:" in err
 
 
+def test_parse_args_from_sys_argv(parser):
+    parser.add_argument("--op", type=str)
+    with patch("sys.argv", ["", "--op", "hello"]):
+        assert parser.parse_args() == Namespace(op="hello")
+
+
 def test_parse_args_invalid_args(parser):
     with pytest.raises(ArgumentError) as ctx:
         parser.parse_args([{}])
diff --git a/jsonargparse_tests/test_subcommands.py b/jsonargparse_tests/test_subcommands.py
index d69bd01..ae46995 100644
--- a/jsonargparse_tests/test_subcommands.py
+++ b/jsonargparse_tests/test_subcommands.py
@@ -15,7 +15,7 @@ from jsonargparse import (
     Namespace,
     strip_meta,
 )
-from jsonargparse_tests.conftest import get_parse_args_stdout, get_parser_help
+from jsonargparse_tests.conftest import get_parse_args_stderr, get_parse_args_stdout, get_parser_help
 from jsonargparse_tests.test_subclasses import CustomInstantiationBase, instantiator
 
 
@@ -53,8 +53,17 @@ def test_subcommands_undefined_subcommand(subcommands_parser):
     pytest.raises(ArgumentError, lambda: subcommands_parser.parse_args(["c"]))
 
 
-def test_subcommands_missing_required_subcommand(subcommands_parser):
-    pytest.raises(ArgumentError, lambda: subcommands_parser.parse_args())
+def test_subcommands_not_given_when_few_subcommands(subcommands_parser):
+    err = get_parse_args_stderr(subcommands_parser, [])
+    assert "error: 'expected \"subcommand\" to be one of {a,b,B}, but it was not provided.'" in err
+
+
+def test_subcommands_not_given_when_many_subcommands(parser, subparser):
+    subcommands = parser.add_subcommands()
+    for subcommand in range(ord("a"), ord("l") + 1):
+        subcommands.add_subcommand(chr(subcommand), subparser)
+    err = get_parse_args_stderr(parser, [])
+    assert "error: 'expected \"subcommand\" to be one of {a,b,c,d,e, ...}, but it was not provided.'" in err
 
 
 def test_subcommands_missing_required_subargument(subcommands_parser):