通过5个知识点轻松搞定Python的作用域

#块级作用域
 
if 1 == 1:
 name = "lzl"
 
print(name)
 
 
for i in range(10):
 age = i
 
print(age)

C:/Users/L/PycharmProjects/s14/preview/Day8/作用域/main.py
lzl
9
 
Process finished with exit code 0

#局部作用域
 
def func():
 name = "lzl"
 
print(name)

Traceback (most recent call last):
 File "C:/Users/L/PycharmProjects/s14/preview/Day8/作用域/main.py", line 23, in <module>
 print(name)
NameError: name 'name' is not defined

#局部作用域
 
def func():
 name = "lzl"
 
func()   #执行函数
print(name)

Traceback (most recent call last):
 File "C:/Users/L/PycharmProjects/s14/preview/Day8/作用域/main.py", line 23, in <module>
 print(name)
NameError: name 'name' is not defined

#作用域链
 
name = "lzl"
def f1():
 name = "Eric"
 def f2():
  name = "Snor"
  print(name)
 f2()
f1()

#终极版作用域
 
name = "lzl"
 
def f1():
 print(name)
 
def f2():
 name = "eric"
 f1()
 
f2()

#终极版作用域
 
name = "lzl"
 
def f1():
 print(name)
 
def f2():
 name = "eric"
 return f1
 
ret = f2()
ret()
 
#输出：lzl

#终极版作用域
 
name = "lzl"
 
def f1():
 print(name)
 
def f2():
 name = "eric"
 f1()
 
f2()
 
# 输出：lzl

li = [lambda :x for x in range(10)]

print(type(li))
print(type(li[0]))
 
# <class 'list'>
# <class 'function'>

#lambada 面试题
 
li = [lambda :x for x in range(10)]
 
res = li[0]()
print(res)
 
#输出：9