Python is the most popular programming language in the world, which is why Python programmers enjoy working with it.
It has simple syntax, numerous libraries and a short learning curve have made it popular with both new and old developers.
So today I will share 10 of the best Python tricks that are not usually learned.
Change the way pandas display numbers
If you want to change the way numbers are displayed within DataFrames, use these useful options to round decimal numbers.
pd.set_option(‘precision’, 2) # Round to two decimal points
This second option also provides the functionality of comma separators between three digits of larger numbers:
pd.options.display.float_format = ‘:,.2f’.format
Select a random element from a sequence
The standard library’s random package offers a variety of useful functions. However, random.choice (seq) is extremely useful.
This allows you to select a random element from an indexable sequence, for example,
tuples, or even
import random as r my_list = [1, 2, 3, "go"] print(r.choice(my_list)) # Random item
A book selector function that receives a sequence of books receives a random selection, removes the item from the list and returns the selection as a string
# We import only the function we need from random import choice def book_picker(books): book_choice = choice(books) books.remove(book_choice) return f"You picked book_choice" books = ["Harry potter", "Don Quixote", "Learn Python by Daniel Diaz", "Dracula"] print(book_picker(books)) # Random choice print(books) # Remaining books
Limitations and Exceptions
If you try to use
random.choice(seq) In a non-indexable sequence, for example,
numeric types, Python will cost an error.
# With Dictionary import random as r scores = "Jhon": 4, "Ben": 3, "Diana": 5 print(r.choice(my_scores)) # Key error
Also, if the Python blank sequence goes up an
# With an empty sequence import random as r empty_list =  print(r.choice(empty_list)) # Index error
The most common technique I have seen for printing the elements of iterables separated by a space is
my_list = [1, 2, 3, 5, 7] for i in my_list: print(i, end=" ") # 1 2 3 5 7
Although it solves the problem, the code is not it Pythons. There is a simpler solution using the unloading operator “*”
my_list = [1, 2, 3, 5, 7] print(*mylist) # 1 2 3 5 7
As you can see, the unpack operator is always set on the left side of Iternes, and he says to the python:
Assign each component of this return to the patient or desired list
Any sequence we can repeat using a for loop is a repeatable sequence. Use the iter () function to determine if a data type can be repeated.
print(iter("This is a string")) # Str Iterable object print(iter(["this", "is", "a", "list"])) # List iterable object print(iter(1)) # Raises an error # Integers can't be iterated
View the properties and methods of a class without leaving the editor
dir() The function returns the attributes and methods of a class. We can use this useful trick to list all the settings within a class type.
-> $ python string = "A string" print(dir(string)) # ['__add__', .....,'upper', 'zfill']
For example, if we needed a string method to convert a string to uppercase but did not want to open the browser, we could use the dir function with a string as input to find the appropriate method.
Call the debugger in 10 letters
breakpoint Available from python 3.6+. This will be called a session of
It may sound like pure comfort (and maybe it is) but for me it’s a really short and elegant way to call a debugger
n_odds = 0 for i in range(1, 14, 2): # Check for the value of i in each iteration breakpoint() # Bad condition if i % 2 == 0: n_odds += 1 print(n_odds)
Check the size of the packages
Your SSD may be loaded after the pip has installed all the libraries required to run your theme park. You can figure out which packages take up the most space by looking at the size of the packages installed. From here, you can decide which packages “sparked joy” and move on Conmaric Process accordingly.
To find the path to the packages installed on your Linux computer, type:
pip3 show "some_package" | grep "Location:"
This will return a path / to / all / packages. Something like: /Users/yourname/opt/anaconda3/lib/python3.7/site-packages
Enter the file path for the command below:
du -h path/to/all/packages
du Reports disk space usage in the file system.
This code will take out the size of each package. The final output line will contain the size of all the packages.
Promote your command-line tool
knock Is a command-line tool for Python that allows you to create intuitive programs and interfaces for the bash shell. Click supports dialogs of options, user guidelines, approval requests, values from environment variables and more.
The following is a sample script that can be used to request a password from a trip operator:
@click.command() @click.option('--password', prompt=True, hide_input=True, confirmation_prompt=True) def encrypt(password): click.echo('Encrypting password to %s' % password.encode('rot13'))
In this tutorial you learned:
- To select a random element from a sequence
- Unload elements with them
- The ability of sets to delete duplicates efficiently
- How to search for methods and variables without leaving the code editor
- The diverse uses of python slices
- How to call a debugger with the function