Python中用print方法向文件中写入内容

import os
os.chdir("/usr/tem")
char="my name is yangyanxing"
f = open("test.txt","w")
print >>f,char

import os
os.chdir("/usr/tem")
char="my name is yangyanxing"
f = open("test.txt","w")
print(char,file=f)

try:
with("man.txt","w") as data:
print >>data,char
except IOError as err:
print("Write error"+ str(err))

f_result=open('result.txt', 'w')
sys.stdout=f_result
print 'print to file'