Common python Functions

Common python Functions

 

Python built-in functions

Enumerate

 

>>> List (enumerate ('abc '))

[(0, 'A'), (1, 'B'), (2, 'C')]

 

The enumerate function can also receive the second parameter.

>>> List (enumerate ('abc', 1 ))

[(1, 'A'), (2, 'B'), (3, 'C')]

Simple Server

Do you want to quickly and conveniently share files in a directory?

# Python2 python-m SimpleHTTPServer # Python 3 python3-m http. server

This will start a server.

 

Evaluate a Python expression

We all know eval functions, but do we know literal_eval functions?

Import ast

My_list = ast. literal_eval (expr)

To replace the following operations:

Expr = [1, 2, 3]

My_list = eval (expr)

Object self-check

In Python, you can use the dir () function to check objects. As shown in the following example:

>>> Foo = [1, 2, 3, 4]

>>> Dir (foo)

['_ Add _', '_ class _', '_ ins INS __',

'_ Delattr _', '_ delitem _', '_ delslice __',...,

'Extend', 'index', 'insert', 'pop', 'delete ',

'Reverse', 'sort ']

 

Ternary Computation

Ternary operations are quick operations for if-else statements, also known as conditional operations. Here are a few examples for your reference. They can make your code more compact and more beautiful.

[On_true] if [expression] else [on_false]

X, y = 50, 25

Small = x if x <y else y