Python

# li = [11,22,33,44]# def F1 (ARG):# Arg.append (55)# # Li = F1 (LI)# F1 (LI)# Print (LI)# It's not important.# Whether it can be executed is called# def F1 ():# Pass# # F1 ()# F2 = 123# # F2 ()# Print (callable (F1))# Print (callable (F2))#

We usually follow this logic when working with files: Open files, manipulate files, and save closed files.In Python, however, it is divided into the following steps: Create a File object, manipulate the file object (read-in, write, and so on), and

Object-oriented programming abbreviation OOP (oop,object-oriented programming) is a programming idea, OOP takes object as the basic unit of program, and an object contains functions of data and manipulation data.The object-oriented design

built-in functions Python has the following functions built-in, which can be used according to the situationMathematical correlation functionDivmod (): Pick-up and remainder>>> divmod (99,10) (9, 9)ABS (): Take absolute value>>> ABS ( -10)10Len ():

file processing File processing mode:[r] Open in read-only mode (read only) [RB] opens in binary read mode[W] Open in write-only mode (empty file before writing) [WB] opens in binary write mode[A] Open in Append mode (append to end of file) [AB]

Function: Split ()There are two functions for split () and Os.path.split () in Python, as follows:Split (): Splits the string. Slices a string by specifying a delimiter and returns a segmented list of stringsOs.path.split (): Splits the file name

First, the dictionary dictDict is stored as a key-value pair, created by using curly braces {} and separating the keys and values with a colon.>>> d={'Chen': 'Zhang':'print ' d{'Chen'Zhang': 80}Assignment operation>>> d['Chen'print d{'Chen' Zhang'

Python is a very powerful programming language, known as the universal Binder in the programming language, it can be a perfect docking with most of the existing programming languages, today to say that using Python to write a file downloaded from

1. First write the regular expression of the expression (add minus, multiplication, multiply negative, except negative, match parentheses innermost)L1_expression = Re.compile (R ' (-?\d+) (\.\d+)? [ -+] (-?\d+) (\.\d+)? ')

Because I often need to back up the contents of the folder into the mail, each open mail, upload files, send, too troublesome, in fact, each time the files are placed in fixed, but the message header is different, so with Python for themselves to

In fact, Python is familiar with the people can use their own Paramiko to write the task of the distribution system, combined with the gevent of the process can be asynchronous processing. If only want to use tools friends can use some tools, like {

Keys for dictionaries There is no limit to the values in the dictionary, which can be any Python object, from standard objects to user-defined objects, but the keys in the dictionary are type-restricted.(1) A key is not allowed to correspond to

Matplotlib is Python's most famous drawing library, which provides a complete set of command APIs similar to those of MATLAB, making it ideal for interactive mapping. It can also be easily used as a drawing control, embedded in GUI applications. Its

The first Python Program-the blog's automatic Access Script and python's automatic accessMotivation Today, a friend wrote a letter saying that he thought the access statistics displayed in his wordpress blog were abnormal and hoped that I could

Python variables and constants, Python variable Constants A variable is a region in the computer memory. It can store values within the specified range and change the value. For variable-based data types, the interpreter allocates the specified

17. python custom functions, 17. python Functions What is a function? To put it bluntly, a series of codes are encapsulated to realize code reuse. What is code reuse? Suppose I have the following requirements: Custom Functions 　　After knowing what

Python learns the sequence of data types, and python Data Types I. Sequence (this article uses python3.5)######################################## ##################### List and tuples are all Sequences# Features:#1. You can obtain specific elements

16. Shallow copy and deep copy in python, 16. python copy Before talking about what is a copy of depth, let's look at this phenomenon: a = ['scolia', 123, [], ]b = a[:]b[2].append(666)print aprint b Why does it affect a if I only modify B? I have

8. Numbers in python, 8. python numbers The numbers in python include integer int, long, float, and complex. The difference is: Int (integer)It is also called a signed integer, which only has a positive or negative integer without a decimal

Python entry ----- introduction, python entry ----- Abstract: Features of The Python language -----> elegance, clarity, and simplicity 1. Applicable Python Fields Web websites and various network services System Tools and scripts As a