我已经定义了一个函数，并希望将它的输出写入一个txt文件，我需要在代码中更改哪些内容？

Question

print "I can write my function to a txt file:" 
my_function = raw_input("File name? ") 

print_bills = input(bills(1010, 200, 100, 120)) 

open(my_function, 'w') 
my_function.write('%r' % (print_bills)) 
my_function.close() 

我在快乐蟒蛇工作，我试图让我的功能写入到一个txt文件，功能是这样的

def bills(mortgage, elec, oil, ph_int_tv): 

    print "Our upcoming mortgage will be approximately %d /month)" % mortgage 

    print "Split between my brother and I, that will be %d /month" % (mortgage/2) 

    print "With a third roomate, it will be %d /month" % (mortgage/3) 

    print "My total bill, per month, with living costs included will be %d /month" % ((mortgage/2)+(elec/2)+(oil/2)+(ph_int_tv/2)) 

    print "I better start saving money!!\n" 

我很新，刚开始瓦特/ LPTHW在线图书...所以我的问题是，我可以在顶级代码中进行更改以使其工作....如果有的话？

Answer 1

您可以重新分配标准输出

imporst sys 
f = open("test.txt", "w") 
sto = sys.stdout # save stdout so we can revert back to it 
sys.stdout = f # from now on, anything that is printed will go to test.txt 

# here, call any method that calls print 
# or even 
print "hello" 

#finally when no more redirection is desired 
f.close() 
sys.stdout = sto # reestablish the regular stdout 

您也可以找到有用的提示在此StackOverflow question一个稍微不同的目的。注意那里的一些解决方案可能只适用于Unix系统。现在

，而上面显示的诀窍是重定向控制台（和/或标准错误，BTW）输出的权宜之计路，而“我能在上面的代码更改为得到这个工作”在暗示这种重定向方法的问题。你可以考虑通过传递一个文件来改写账单（），方法是用sys.stdout或你自己选择的文件调用它。类似：

from __future__ import print_function # might as well get used to Python 3.0 print syntax 

def bills(outFile, mortgage, elec, oil, ph_int_tv): 
    print("Our upcoming mortgage will be approximately %d /month)" % mortgage, file=outFile) 
    print("Split between my brother and I, that will be %d /month" % (mortgage/2), file=outFile) 
    print("With a third roomate, it will be %d /month" % (mortgage/3), file=outFile) 
    print("My total bill, per month, with living costs included will be %d /month" 
      % ((mortgage/2)+(elec/2)+(oil/2)+(ph_int_tv/2)), file=outFile) 

    print("I better start saving money!!\n", file=outFile) 

Answer 2

基本上，在Python，标准输出可以被处理（几乎）像任何其他文件对象。因此，您可以将文件对象分配到sys.stdout和print语句将写入文件而不是打印在终端窗口上。

像下面这样的东西可能会起作用。

import sys 

myfile = open('myfile.txt', 'w') 
stdout_bckp = sys.stdout 
sys.stdout = myfile 
bills(1010, 200, 100, 120) 
sys.stdout = stdout_bckp 
myfile.close() 

如果你对某种UNIX机器，你也可以从你从终端开始为这样一个程序的输出重定向：

$ python myscript.py > myfile.txt 

Answer 3

def bills(mortgage, elec, oil, ph_int_tv): 
    print "Our upcoming mortgage will be approximately %d /month)" % mortgage 
    print "Split between my brother and I, that will be %d /month" % (mortgage/2) 
    print "With a third roomate, it will be %d /month" % (mortgage/3) 
    print "My total bill, per month, with living costs included will be %d /month" % ((mortgage/2)+(elec/2)+(oil/2)+(ph_int_tv/2)) 
    print "I better start saving money!!\n" 

def my_function(my_file,print_bills): 
    f=open(my_file, 'w') 
    f.write('%r' % (print_bills)) 
    f.close() 

print "I can write my function to a txt file:" 
my_file = raw_input("File name? ") 

print_bills = bills(1010, 200, 100, 120) 


my_function(my_file, print_bills)