Python basic statements

Before learning the python advanced tutorial, everyone has come into contact with many python statements. In this article, we summarize some basic commonly used statements in Python and briefly introduce the uses and standard formats of these commonly used python statements. Together for easy reference and review.

(1), assignment: create variable reference value
a,b,c='aa','bb','cc'

(2), call: execute function
log.write('spam,name')

Print, output: call the print object, print statement
print ('abc')

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

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, The loop continues

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 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 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, check debugging

assert a>b,'a roo small'

The above is This is a summary of the method for students with basic knowledge. For python beginners, you can click on the statement to view the specific operation method introduction.