Python common functions

http://blog.csdn.net/pipisorry/article/details/45771045

Python built-in functions

Enumeration function Enumerate

>>> List (Enumerate (' abc '))

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

The enumerate function can also receive a second parameter.

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

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

Simple server

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

# python2python-m simplehttpserver# Python 3python3-m http.server

This will cause a server to start.

Evaluate a Python expression

We all know the Eval function, but do we know the Literal_eval function?

Import AST

My_list = Ast.literal_eval (expr)

To replace the following actions:

expr = "[1, 2, 3]"

My_list = eval (expr)

Object Self-Test

In Python you can check the object using the Dir () function. As the following example:

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

>>> dir (foo)

[' __add__ ', ' __class__ ', ' __contains__ ',

' __delattr__ ', ' __delitem__ ', ' __delslice__ ', ...,

' Extend ', ' index ', ' Insert ', ' pop ', ' Remove ',

' Reverse ', ' sort ']

Ternary operations

A ternary operation is a shortcut to a If-else statement, also known as a conditional operation. Here are a few examples that you can use to make your code more compact and aesthetically pleasing.

[On_true] if [expression] else [on_false]

X, y = 50, 25

small = x if x < y else y

from:http://blog.csdn.net/pipisorry/article/details/45771045

Ref:nifty Python Tricks

Python common functions