前向引用
阿新 • • 發佈：2017-06-03
rac recent har 函數調用 file back 前向引用 lin error:
函數定義 在 函數調用 之前
而函數定義的順序無關緊要
就如同變量的定義一般
a = 1 b = 2 #兩者沒什麽不同 b = 2 a = 1
例
def bbb():
print(‘this is b‘)
aaa()
def aaa():
print(‘this is a‘)
bbb()
#--------->
this is b
this is a
def aaa():
print(‘this is a‘)
def bbb():
print(‘this is b‘)
aaa()
bbb()
#----------->
this is b
this is a
不可以這樣
def bbb():
print(‘this is b‘)
aaa()
bbb()
def aaa():
print(‘this is a‘)
#--------->
Traceback (most recent call last):
this is b
File "E:/pycharm/TEST.py", line 600, in <module>
bbb()
File "E:/pycharm/TEST.py", line 599, in bbb
aaa()
NameError: name ‘aaa‘ is not defined
前向引用