Basics Tutorial python: python basic knowledge about the variable name

Variable names
1, consists of: numbers, letters, underscores

2, variable names to be meaningful

3, the plurality of words are underlined as user_id

4, python variable names do not show Hump

Claim:

a, can not start with a number

b, can not use the keyword

c, try not to use python built-in functions

String:
1, are referred to as quoted string

2, common marks: '', '', '' '', '' '' '' '' '' "" "" ""

3, support operations: +, *

Value:
1, supports operators: +, -, *, /, ** (index),% (take the remainder) // (taken supplier)

Such as: 3 * 4 = 81

     5%3=2

     5//3=1

if conditional statement

格式1：<br>if 1==1：
　　print（“ok”）
else：
　　print（“error”）

嵌套：
if 1 ！= 1:
    if 2 ！=2:
        print("1")
    else:
        print("2")
else:
    print("---end---")

1
repeatedly found:

score = input("请输入你的分数：")
if score == "90":
    print("优秀")
elif score == "80":
    print("良好")
elif score == "70":
    print("一般")
elif score == "60":
    print("及格")
else:
    print("不及格")

Supplementary: pass usage (set up is not executed)

输出1-100的奇数：
n = 0
while n <= 100:
    n+=1
    if n%2 == 0:
         pass
    else:
        print(n)
print("---end---")

Loop:
infinite loop:

import time
while 1==1：
    print("ok",time.time())

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Knowledge of the point spread:

Variable name:

1, start with an underscore or lowercase letters, optionally followed, any combination of uppercase and lowercase letters and numbers (but generally begin with an underscore have a special meaning, is not recommended) followed by an underscore

2, is recommended to use the English words having a fixed meaning or abbreviations, such as srv = server, skt = socket, generally naming rule based posix

3, recommended hump writing: big hump used to write the class, such as MyFirstLove, small hump as myFirstLove or posix used to write a variable or function names, both compared to the relatively posix recommended wording, such as: my_first_love

4, to avoid reserved words and keywords, such as class, def, break, for; (print out all keywords METHODOLOGY, import keyword; // first cause the key module print (keyword.kwlist) // Print)

This python on this article on the basis of knowledge on the introduction of a variable name to it, the more variable names python Detailed contents