如何預定義python變量

Question

以下代碼可以工作，但是有點混亂，即使代碼可以工作，大多數IDE也會顯示未定義變量=>“ myFile”的錯誤。

i = 0
block = False
while i < 10:
   if block == True:
      myFile.write("End of a Turn.")
   block = True
   myFile = open("path/of/my/file/"+str(i)+".txt", "w")
   myFile.write("The turn begin.")
   i += 1

我想做的是在第一次分配之前“預定義”變量：

#myFile = SOMETHING_THAT_DOES_NOT_RUIN_THE_FOLLOWING_CODE
myFile = None #RESOLVE
i = 0
block = False
while i < 10:
   if block == True:
      myFile.write("End of a Turn.")
   block = True
   myFile = open("path/of/my/file/"+str(i)+".txt", "w")
   myFile.write("The turn begin.")
   i += 1

為了避免一些IDE理解問題。

求助，

S.

Answer 1

您可以這樣做。

myFile = None
i = 0
block = False
while i < 10:
   if block and myFile:
       # ...

或者，可能更干凈：

for i in range(9):
    with open(str(i) + '.txt', 'w') as myFile:
        myFile.write('The turn begin. End of a turn')
with open(str(i + 1) + '.txt', 'w') as myFile:
        myFile.write('The turn begin.')