Python 基础语法

 

 

Python 基础语法	基础语法	运行结果
数学运算符	a = 20 b = 3 print(a % b) print(a // b) print(a ** b)	2 6 8000
逻辑操作符	a = 20 b = 3 c = 10 print ( a>b or a>c  ) print ( a>b and a>c  ) print (not a > b  )	True True False
成员运算符 （返回结果是布尔类型）	list = [12, 23, 454, 'hello', True, 22] print(454 in list) print(45 in list)	True False
身份运算符	a = 9 b = 10 print (a+1 is b) print (a is b) print (a+1 is not b) print (a is not b)	True False False True
条件判断 if else (1)	a= 10 if a < 5:     print("small") elif a < 8:     print("medium") else:     print("big")	big
条件判断 if else (2)	# a = [] # a = () # a="" # a= None  a = {} if a:     print("ture") else:     print("false")	FALSE
循环while	a = 1 while a < 10:     print(a)     a+=2	1 3 5 7 9
遍历for (1)	list = [123, 'hello', 3+2, 8.8, 'aa'] for x in list:     print(x)	123 hello 5 8.8 aa
遍历for (2) range(start, stop[, step]) -> range object	list = range(1, 10, 3) for x in list:     print(x)	1 4 7
跳出循环 (1)	a = range(1, 10) for x in a:     if x % 2 == 0:         continue     else:         print(x) print("-----------") for x in a:     if x % 2 == 0:         break     else:         print(x)	1 3 5 7 9 ----------- 1
跳出循环 (2)	a = range(1, 10) for x in a:     if x % 2 == 0:         break     else:         print(x) else:     print('ok')	1
跳出循环 (3)	a = range(1, 10) for x in a:     if x % 2 == 0:        continue     else:         print(x) else:     print('ok')	1 3 5 7 9 ok