如何通过python创建文本文件？

Question

I have no idea why this isn't working

import time

consumption = "300"
spend = "5000"

def create_report(consumption, spend):

    date = time.strftime("%d/%m/%Y")
    date = date + ".txt"
    file = open(date, "w")
    file.write("Since: ", pastdate)
    file.write("Consumption in £: ", consumption)
    file.write("Overall spend in £: ", spend)
    file.close()

create_report(consumption, spend)

I want to be able to simply create a text file and write in it with the the text file's name as today's date. The "w" doesn't seem to be creating the file. I am getting the error:

file = open(date, "w")
FileNotFoundError: [Errno 2] No such file or directory: '01/03/2016.txt'

Answer 1

You seem to be running this on an operating system where / is a directory separator.

Try this code instead:

date = time.strftime("%d%m%Y") + '.txt'
with open(date, "w") as f:
    f.write("Since: ", pastdate)
    f.write("Consumption in £: ", consumption)
    f.write("Overall spend in £: ", spend)

Note a few things:

• using with is much better practice, as it guarantees your file is closed, even if an exception occurs
• it is bad practice to use file for your file name

Answer 2

import time

consumption = "300"
spend = "5000"

def create_report(consumption, spend):
    # '/' is used for path like `C:/Program Files/bla bla` so you can't use it as a file name
    date = time.strftime("%d_%m_%Y")
    date = date + ".txt"
    file = open(date, "w")
    # NameError: name 'pastdate' is not defined
    # file.write("Since: ", pastdate)

    # The method `write()` was implemented to take only one string argument. So ',' is replaced by '+'
    file.write("\n Consumption in £: " + consumption)
    file.write("\n Overall spend in £: " + spend)
    file.close()

create_report(consumption, spend)