为什么写此文件不起作用？

Question

I am somewhat new to python and am trying to write to a text file. However, the following code doesn't write the variables to the text file, it just creates an empty text file. Does any know why this is?

crop = input("Which crop? ")
quantity = input("How many? ")

def appendA ():
 file.write (quantity + ' ')

def appendB ():
 file.write ('\n')
 file.write (crop + ' ')
 file.write (quantity + ' ')

file = open ('cropdatabase.txt', 'a+')

if crop in file:
 appendA ()
else:
 appendB ()

Answer 1

Easy solution you need to be using global variables. And close the file.

crop = input("Which crop? ")
quantity = input("How many? ")

def appendA ():
 file.write (quantity + ' ')

def appendB ():
 file.write ('\n')
 file.write (crop + ' ')
 file.write (quantity + ' ')

file = open ('cropdatabase.txt', 'a+')

if crop in file:
 appendA ()
else:
 appendB ()
file.close()

EDIT: You don't need global variables for this my mistake...