将python对象__str__写入文件

Question

class C:
    pass

file = open("newfile.txt", "w")

for j in range(10):
    c = C()
    print c
    file.write(c)

file.close()

Is there anything wrong in this code?
I am new to python and want to write the content that's outputted by 'print c' to file ?

Answer 1

You can use the str() function to convert an object to a string the same way print does:

for j in range(10):
    c = C()
    print c
    file.write(str(c))

This will not include a newline, however. If you need a newline as well, you can manually add one:

file.write(str(c) + '\n')

or use string formatting:

file.write('{}\n'.format(c))

or use the print statement with redirection ( >> fileobject ):

print >> file, c