ERR: Raise ImportError when xlrd is not present
State: closed

- [x] Related issues: #8515, #14673
- [x] tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] whatsnew entry


Labels:
name: Error Reporting
description: Incorrect or improved errors from pandas
name: IO Excel
description: read_excel, to_excel

Comments:
lgtm. minor comments by @gfyoung 
wait for #17619 to merge

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=h1) Report
> Merging [#17613](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/fedf92287d0216d54fe756829362e1d10a3fdc58?src=pr&el=desc) will **decrease** coverage by `0.02%`.
> The diff coverage is `66.66%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/17613/graphs/tree.svg?height=150&token=eZ4WkYLtcO&width=650&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #17613      +/-   ##
==========================================
- Coverage   91.19%   91.17%   -0.03%     
==========================================
  Files         163      163              
  Lines       49625    49629       +4     
==========================================
- Hits        45257    45250       -7     
- Misses       4368     4379      +11
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.96% <66.66%> (-0.01%)` | :arrow_down: |
| #single | `40.19% <0%> (-0.07%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/excel.py](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=tree#diff-cGFuZGFzL2lvL2V4Y2VsLnB5) | `80.37% <66.66%> (-0.18%)` | :arrow_down: |
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.77% <0%> (-0.1%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=footer). Last update [fedf922...dee1998](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).

# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=h1) Report
> Merging [#17613](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/fedf92287d0216d54fe756829362e1d10a3fdc58?src=pr&el=desc) will **decrease** coverage by `0.02%`.
> The diff coverage is `66.66%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/17613/graphs/tree.svg?width=650&height=150&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=tree)

```diff
@@            Coverage Diff             @@
##           master   #17613      +/-   ##
==========================================
- Coverage   91.19%   91.17%   -0.03%     
==========================================
  Files         163      163              
  Lines       49625    49629       +4     
==========================================
- Hits        45257    45250       -7     
- Misses       4368     4379      +11
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `88.96% <66.66%> (-0.01%)` | :arrow_down: |
| #single | `40.19% <0%> (-0.07%)` | :arrow_down: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/io/excel.py](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=tree#diff-cGFuZGFzL2lvL2V4Y2VsLnB5) | `80.37% <66.66%> (-0.18%)` | :arrow_down: |
| [pandas/io/gbq.py](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=tree#diff-cGFuZGFzL2lvL2dicS5weQ==) | `25% <0%> (-58.34%)` | :arrow_down: |
| [pandas/core/frame.py](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvZnJhbWUucHk=) | `97.77% <0%> (-0.1%)` | :arrow_down: |

------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=footer). Last update [fedf922...dee1998](https://codecov.io/gh/pandas-dev/pandas/pull/17613?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).