融入python-6-赋值

2020-12-24 00:28

阅读:348

标签:typeerror   中国   ssi   tar   error:   表数   values   most   字符串   

变量赋值

x,y,z = 1,2,3

灵活使用,可以减少代码量

key,value = dict.popitem()

*星号的使用可以代表多个值

#正常

x,y,z = 1,2,3  

#参数列表数目不匹配

x,y,z = 1,2,3,4
Traceback (most recent call last):
File "", line 1, in
ValueError: too many values to unpack (expected 3)
x,y,z = 1,2
Traceback (most recent call last):
File "", line 1, in
ValueError: not enough values to unpack (expected 3, got 2)

#星号来收集

x,y,*z = 1,2,3,4
z
[3, 4]

 

#两个星号不可以!

*x,y,*z = 1,2,3,4,5,6
File "", line 1
SyntaxError: two starred expressions in assignment

 

 

链式赋值

x = y = z = ‘你好,中国‘

运算赋值

+=  -=  *=  /=

x
1
x += 3
x
4
x -= 1
x
3
x *= 7
x
21
x /= 9
x
2.3333333333333335

字符串运算

x = "你好"
x
你好
x += ",悟空。"
x
你好,悟空。
x -= "哈哈"
Traceback (most recent call last):
  File "", line 1, in 
TypeError: unsupported operand type(s) for -=: str and str
x -= "空。"
Traceback (most recent call last):
  File "", line 1, in 
TypeError: unsupported operand type(s) for -=: str and str
x *= "哈哈"
Traceback (most recent call last):
  File "", line 1, in 
TypeError: cant multiply sequence by non-int of type strx *= 2
x
你好,悟空。你好,悟空。
x /= 3
Traceback (most recent call last):
  File "", line 1, in 
TypeError: unsupported operand type(s) for /=: str and int

 

融入python-6-赋值

标签:typeerror   中国   ssi   tar   error:   表数   values   most   字符串   

原文地址:https://www.cnblogs.com/qianheng/p/13211908.html


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