任何人都可以向我解释为什么a和b下面的两个函数表现不同.函数a在本地更改名称,b更改实际对象.
我在哪里可以找到这种行为的正确文档？
def a(names):
names = ['Fred','George','Bill']
def b(names):
names.append('Bill')
first_names = ['Fred','George']
print "before calling any function",first_names
a(first_names)
print "after calling a",first_names
b(first_names)
print "after calling b",first_names
输出：
before calling any function ['Fred','George'] after calling a ['Fred','George'] after calling b ['Fred','Bill']