Learnpythonthehardway練習17不工作

Question

我正在練習17，似乎無法讓它運行。

我運行它像python test.py raw.txt copied.txt但收到此錯誤：

Copying from raw.txt to copied.txt 
Traceback (most recent call last): 
    File "test.py", line 9, in <module> 
    in_file = open(from_file) 
IOError: [Errno 2] No such file or directory: 'raw.txt' 

我的代碼： 從SYS進口的argv 從os.path中存在進口

script, from_file, to_file = argv 

print "Copying from %s to %s" % (from_file, to_file) 

# we could do these two on one line too, how? 
in_file = open(from_file) 
indata = in_file.read() 

print "The input file is %d bytes long" % len(indata) 

print "Does the output file exist? %r" % exists(to_file) 
print "Ready, hit RETURN to continue, CTRL-C to abort." 
raw_input() 

out_file = open(to_file, 'w') 
out_file.write(indata) 

print "Alright, all done." 

out_file.close() 
in_file.close() 

Answer 1

試試這個： 現在所有文件正在您的工作目錄中搜索

from sys import argv 
from os import getcwd 
from os.path import exists, join 

cwd = getcwd() 
script, from_file, to_file = argv 

print "Copying from %s to %s" % (from_file, to_file) 

# we could do these two on one line too, how? 
in_file = open(join(cwd, from_file)) 
indata = in_file.read() 

print "The input file is %d bytes long" % len(indata) 

print "Does the output file exist? %r" % exists(join(cwd, to_file)) 
print "Ready, hit RETURN to continue, CTRL-C to abort." 
raw_input() 

out_file = open(join(cwd, to_file), 'w') 
out_file.write(indata) 

print "Alright, all done." 

out_file.close() 
in_file.close()