Summary of common python statements

In the process of learning python, we will encounter some statements that we often encounter. Below I will take stock of these statements to facilitate everyone's memory.

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Commonly used python statements:

(1), assignment: Create variable reference value

a,b,c='aa','bb','cc'

(2), call: execute function

log.write('spam,name')

Print, output: call print object, print statement

print ('abc')

(3) if, elif, else: select conditional statements, if statements, else and elif statements

if 'iplaypython' in text:
    print (text)

(4) for, else: sequence iteration

for x in list:
    print x

(5), while , else: general loop statement

while a > b :
    print 'hello'

(6), pass: placeholder (empty)

while True:
    pass

(7), break: exit the loop

while True:
    if exit:
        break

(8) , continue: skip the current loop and continue the loop

while True:
    if skip:
        continue

The following statements are used in relatively large programs. Regarding functions, classes, exceptions and modules, they also only briefly introduce the purpose and format of the methods.

(9), def: define functions and methods

def info(a,b,c=3,*d):
    print (a+b+c+d[1])

(10), return: function return value

def info(a,b,c=3,*d):
    return a+b+c+d[1]

(11), python global: namespace, role Domain

x = 'a'
def function():
    global x ; x = 'b'

(12), import: access, import module

import sys

(13), from: attribute access

from sys import stdin

(14), class: create Object, class definition method

class Person:
    def setName(self,name):
        self.name = name
    def getName(self):
        return self.name
    def greet(self):
        print 'hello,%s' % self.nameclass Person:
    def setName(self,name):
        self.name = name
    def getName(self):
        return self.name
    def greet(self):
        print 'hello,%s' % self.names

(15), try, except, finally: python catch exception

try:
    action()
except:
    print ('action error')

(16), raise: trigger exception

raise Endsearch (location)

(17), assert: python assertion, inspection and debugging

assert a>b ,'a roo small'

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