如何知道用户是否使用Python按Enter键

Question

如何知道用户是否使用Python按 Enter ？

例如：

user = raw_input("type in enter")
if user == "enter":
    print "you pressed enter"
else:
    print "you haven't pressed enter"

Answer 1

正如@jonrsharpe所说，正确退出raw_input功能的唯一方法是按Enter键。因此，解决方案是检查结果是否包含某些内容：

text = raw_input("type in enter")
if text == "":
    print "you pressed enter"
else:
    print "you typed some text before pressing enter"

我看到退出raw_input函数的唯一其他方法会引发异常，例如：

如果您输入EOFError ，则
• ^D 如果您输入KeyboardInterrupt
，则
• ^C
• ...

Answer 2

user_input=input("ENTER SOME POSITIVE INTEGER : ")
if((not user_input) or (int(user_input)<=0)):    
  print("ENTER SOME POSITIVE INTEGER GREATER THAN ZERO") #print some info
  import sys        #import
  sys.exit(0)       #exit program 
'''
#(not user_input) checks if user has pressed enter key without entering  
# number.
#(int(user_input)<=0) checks if user has entered any number less than or 
#equal to zero.
'''