11 函数参数 global nonlocal 强制修改全局变量

global/nonlocal强制修改全局变量

子作用域中只能 找到父级中的值 ，默认无法重新为父级的变量进行赋值。(global/nonlocal可以强制做)

# #####################
name = 'oldboy'
def func():
    name = 'alex' # 在自己作用域再创建一个这样的值。
    print(name)
func()
print(name)



# #####################
name = [1,2,43]
def func():
    name.append(999)
    print(name)
func()
print(name)

# ###################### 如果非要对全局的变量进行赋值
# 示例一
name = ["老男孩",'alex']
def func():
    global name
    name = '我'
func()
print(name)
# 示例一
name = "老男孩"
def func():
    name = 'alex'
    def inner():
        global name
        name = 999
    inner()
    print(name)
func()
print(name)


name = "老男孩"
def func():
    name = 'alex'
    def inner():
        global name
        name = 999
    inner()
    print(name)
func()
print(name)

# ############################## nonlocal
name = "老男孩"
def func():
    name = 'alex'
    def inner():
        nonlocal name # 找到上一级的name
        name = 999
    inner()
    print(name)
func()
print(name)