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.