語法錯誤

Question

我寫了下面的腳本，其生成SyntaxError：

#!/usr/bin/python 
print "Enter the filename: " 
filename = raw_input("> ") 
print "Here is your file %r: ", % filename 

txt = open(filename) 
print txt.read() 
txt.close() 

以下是錯誤：

File "ex02.py", line 4 
    print "Here is your file %r: ", % filename 
            ^
SyntaxError: invalid syntax 

我應該如何解決這個問題？

Answer 1

麻煩就出在這裏：

print "Here is your file %r: ", % filename 
          ^

當print找到一個逗號，它使用的是作爲參數分隔符，可以用看到：

>>> print 1,2 
1 2 

在這種情況下，下一個參數需要有效，並且序列% filename不是。

你什麼意思無疑是：

print "Here is your file %r: " % filename 

按照以下成績單：

>>> filename = "whatever" 

>>> print "file is %r", % filename 
    File "<stdin>", line 1 
    print "file is %r", % filename 
         ^
SyntaxError: invalid syntax 

>>> print "file is %r" % filename 
file is 'whatever' 

Answer 2

是不需要的昏迷，嘗試：

filename = raw_input("> ") 
print "Here is your file %r: " % filename 

Answer 3

你不能有一個逗號那裏。

print ("Here is your file %r: " % filename),