为什么这个语法无效？

Question

为什么抱怨语法无效？

#! /usr/bin/python

recipients = []
recipients.append('chris@elserinteractive.com')

for recip in recipients:
    print recip

我一直在：

File "send_test_email.py", line 31
    print recip
              ^
SyntaxError: invalid syntax

Answer 1

如果您使用的是Python 3，print是一个函数。这样称呼：print(recip)。

Answer 2

在python 3中，print不再是声明，而是function。

Old: print "The answer is", 2*2
New: print("The answer is", 2*2)

更多python 3 print功能：

Old: print x,           # Trailing comma suppresses newline
New: print(x, end=" ")  # Appends a space instead of a newline

Old: print              # Prints a newline
New: print()            # You must call the function!

Old: print >>sys.stderr, "fatal error"
New: print("fatal error", file=sys.stderr)

Old: print (x, y)       # prints repr((x, y))
New: print((x, y))      # Not the same as print(x, y)!

Answer 3

如果它是Python 3，print现在是一个函数。正确的语法是

print (recip)