常见用法:
1. 作为参数或变量的分隔符
def func(a, b):
return a, b
a, b = 1, 2
不常见用法:
2. 在print函数中的应用,使得输出不换行
list = ['a', 'b', 'c']
for i in list:
print(i,)
output:
a b c
print(i)
output:
a
b
c
3. 将变量转换为元组,从list中取数据
a = 1
b = a,
print(a)
print(b)
output:
1
(1,)
a = [1]
b, = a
print(a)
print(b)
output:
[1]
1
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