return file object from generator python

Question

I'm using the following to read a file and let me edit a line inside the file

haystack = open('myxml.xml') 

def needlefinder(file):
    for line in file:
        if 'MyTag' in line:
            line = line.replace('alt="1"','alt="0"')
            #print line

    needle = needlefinder(haystack)
    print needle

Im wondering how can I return the file as a string? I want to basically edit this line on the fly and return the whole edited document.

Answer 1

Just place all the lines in a list (of string ), and return it at the end of your function, like that:

def needlefinder(file_):
    lines = list()
    for line in file_:
        if 'MyTag' in line:
            line = line.replace('alt="1"','alt="0"')
        lines.append(line)
    return lines

haystack = open('myxml.xml')
needle = needlefinder(haystack)
print needle

Answer 2

如果您询问如何以字符串形式返回任何内容，请添加str（）

return(str())