将打印函数的输出写入文本文件

Question

I want to save ''contents'' to a new text file in python. I need to have all the words in lowercase to be able to find the word frequency. '''text.lower()''' didn't work. Here is the code;

text=open('page.txt', encoding='utf8')
for x in text:
print(x.lower())

I want to save the results of print to a new text file. How can I do that?

Answer 1

You are opening the file page.txt for reading, but it's not open to write. Since you want to save to a new text file, you might also open new_page.txt where you write all of the lines in page.txt lowercased:

# the with statement is the more pythonic way to open a file
with open('page.txt') as fh:

    # open the new file handle in write mode ('w' is for write, 
    # it defaults to 'r' for read
    with open('new_page.txt', 'w') as outfile:
        for line in fh:
            # write the lowercased version of each line to the new file
            outfile.write(line.lower())

The important thing to note is that the with statement negates the need for you to close the file, even in the case of an error

Answer 2

You can use file parameter in print to directly print the output of print(...) to your desired file.

text=open('page.txt', encoding='utf8')
text1=open('page1.txt', mode='x',encoding='utf8') #New text file name it according to you
for x in text:
    print(x.lower(),file=text1)
text.close()
text1.close()

Note: Use with while operating on files. As you don't have to explicitly use .close it takes care of that.

Answer 3

import sys 
stdoutOrigin=sys.stdout 
sys.stdout = open("yourfilename.txt", "w")
#Do whatever you need to write on the file here.
sys.stdout.close()
sys.stdout=stdoutOrigin