5 Interesting Python Libraries. Have you ever think data visualisation... | by Christopher Tao | Towards Data Science

As one of the most popular programming languages, Python has a huge number of excellent libraries that facilitate development such as Pandas, Numpy, Matplotlib, SciPy, etc.
However, in this article, I’m going to introduce to you some libraries that are more interesting rather than very useful. I believe these libraries can show another aspect of Python and the thrive of the community.
Honestly, when I first time see this library, I questioned why people may need this? Bashplotlib is a Python library that enables us to plot data in a command-line stdout environment.
Soon I realised that it is probably going to be useful when you don’t have any GUI available. Well, this scenario may not be that frequent, but it doesn’t prevent my curiosity and to feel it is a very interesting Python library.
Bashplotlib can be easily installed with pip.
pip install bashplotlib
Let’s see some examples. In the code below, I imported numpy to generate some random arrays, as well as the bashplotlib, of course.
import numpy as npfrom bashplotlib.histogram import plot_histarr = np.random.normal(size=1000, loc=0, scale=1)
plot_hist is a function from bashplotlib that is for plotting 1-D data in a histogram, just like plt.hist does in Matplotlib. Then, I use Numpy to generate a random array with 1,000 numbers that are normally distributed. After that, we can easily plot this data as follows:
plot_hist(arr, bincount=50)
The output is like this
Isn’t that interesting? :)
Also, you can plot your data in a scatter plot from text files.
The Bashplotlib I have just introduced is for plotting data in the command-line environment, whereas PrettyTable is for output tables in a pretty format.
Similarly, we can easily install this library using pip.
pip install prettytable
Firstly, let’s import the lib.
from prettytable import PrettyTable
Then, we can use PrettyTable to create a table object.
table = PrettyTable()
Once we have the table object, we can start to add fields and data rows.
table.field_names = ['Name', 'Age', 'City']table.add_row(["Alice", 20, "Adelaide"])table.add_row(["Bob", 20, "Brisbane"])table.add_row(["Chris", 20, "Cairns"])table.add_row(["David", 20, "Sydney"])table.add_row(["Ella", 20, "Melbourne"])
To display the table, just simply print it!
print(table)
PrettyTable also supports refining the table styles, in almost every perspective that you may think. For example, you can right-align the text in the table:
table.align = 'r'print(table)
Sort table by a column
table.sortby = "City"print(table)
You can even get the HTML string of the table
This library is not only very interesting but also very useful, in my opinion. Many times you may want to implement a “fuzzy” search feature for your program. FuzzyWuzzy provides you with an out-of-box and light-weighted solution for this.
Install it from pip as usual.
pip install fuzzywuzzy
Import the library:
from fuzzywuzzy import fuzz
Let’s do a simple test.
fuzz.ratio("Let’s do a simple test", "Let us do a simple test")
As shown the result “93” means that these two strings have 93% similarity, which is pretty high.
When you have a list of strings, and you want to search a term against all of them, FuzzyWuzzy will help you to extract the most relevant ones with their similarities.
from fuzzywuzzy import processchoices = ["Data Visualisation", "Data Visualization", "Customised Behaviours", "Customized Behaviors"]process.extract("data visulisation", choices, limit=2)process.extract("custom behaviour", choices, limit=2)
In the above example, the parameter limit tells FuzzyWuzzy to extract the “top n” results for you. Otherwise, you will get a list of tuples with all of these original strings and their similarity scores.
Do you usually develop command-line tools using Python? If so, this interesting library is going to help you when your CLI tool is processing something time-consuming by showing a progress bar to indicate how much has been done.
Installation using pip, again.
pip install tqdm
When you have a for-loop using range function, just replace it by trange from tqdm.
from tqdm import trangefor i in trange(100):    sleep(0.01)
More generally, you may want to loop a list. That’s also easy with tqdm.
from tqdm import tqdmfor e in tqdm([1,2,3,4,5,6,7,8,9]):    sleep(0.5)  # Suppose we are doing something with the elements
tqdm works for not only the command-line environment but also iPython/Jupyter Notebook.
Do you want to add some colours to your command-line applications? Colorama makes it very easy to output everything in your preferred colour.
Installing Colorama needs pip again.
pip install colorama
Colorama supports to render output text colour in “foreground” (the text colour), “background” (the background colour) and “style” (extra styles of the colour). We can import
from colorama import Fore, Back, Style
Firstly, let’s show some warnings using yellow colour.
print(Fore.YELLOW)print("This is a warning!")
Then, let’s try to show some errors using a red background colour.
print(Back.RED + Fore.WHITE + "This is an error!")
That red is too bright. Let’s use the “dim” style.
print(Back.RESET + Style.DIM + "Another error!")
Here we are setting “RESET” for back to change the background colour to default.
The “DIM” style makes the font kind of invisible. When we want to change everything back to normal, simply set “Style” to “RESET_ALL”
print(Style.RESET_ALL)
Thanks to these open-source developers who contribute to the Python community and thrive it.
Before I’ve seen the library Bashplotlib, I have to say that I never had such an idea to plot data in a command-line environment. No matter it may or may not be useful for you, I would say that the diversity of the development ideas and creatives of people never ended.
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