Python If-Else语句语法错误

我只是在玩弄If-Else语句，我想知道如何让它循环来再次问这个问题，如果第一个If-Else是真的

此外，您将如何在末尾添加一个通用的Else，使其对输入的任何其他名称都有意义

我使用的是

python2.7

上的

Raspberry Pi。

#!/usr/bin/python

name=""
while name !="quit":
 name = raw_input("What is your name? ")
 print "Hello", name
 import time
 time.sleep(2)
 if name == "Jack":
   print "Jack, I have decided that you are awesome."
   time.sleep(2)
   print "And I am a computer so I cannot be wrong"
 else:
   print "Oh, you are not Jack?"
   time.sleep(2)
   print "Haha, Jack is better than you"
 if name == "Ronan":
   print "Ronan, I know everything about you."
   time.sleep(2)
   print "For example, I know you hate cats."
 else:
   print "Oh, you are not Ronan?"
   time.sleep(2)
   print "Perhaps you can convince him that he loves cats"

---

你错过了这一行的结束语

print“Jack，我认为你很棒。”

最后一行的

break

命令将帮助终止循环

 name=""
while name !="quit":
 name = raw_input("What is your name? ")
 print "Hello", name
 import time
 time.sleep(2)
 if name == "Jack":
   print "Jack, I have decided that you are awesome."
   time.sleep(2)
   print "And I am a computer so I cannot be wrong"
 else:
   print "Oh, you are not Jack?"
   time.sleep(2)
   print "Haha, Jack is better than you"
 if name == "Ronan":
   print "Ronan, I know everything about you."
   time.sleep(2)
   print "For example, I know you hate cats."
 else:
   print "Oh, you are not Ronan?"
   time.sleep(2)
   print "Perhaps you can convince him that he loves cats"
 if name != "jack" and name != "Ronan":
   print "I am not wrong"

 break

 if name == "Jack":
   print "Jack, I have decided that you are awesome."
   time.sleep(2)
   print "And I am a computer so I cannot be wrong"
   continue

---

你忘了在

print“哈哈，杰克比你强

行中加括号了

您应该只导入时间一次，在while循环之外，最好是在脚本开始时。您不需要在name！=“quit”时导入时间

和

if/else

构造应如下所示：

if something:
    #do something

elif otherthing:
    #do something else

else:
    #if everything above fails, do this

KNOWN_NAMES = ('Jack', 'Ronan', 'Whomever')
QUIT_VERBS = ('quit', 'q', 'exit', 'end', 'bye')

while True:
    name = raw_input("What is your name? ")
    if name.lower() in QUIT_VERBS:
        break

    if name == "Jack":
        print "Jack, I have decided that you are awesome."
        time.sleep(2)
        print "And I am a computer so I cannot be wrong"
    else:
        print "Oh, you are not Jack?"
        time.sleep(2)
        print "Haha, Jack is better than you"
    if name == "Ronan":
        # etc, etc

    if name not in KNOWN_NAMES:
        print 'I know nothing about no "%s"' % name

---

您可以使用

continue

将执行返回到循环的顶部

 name=""
while name !="quit":
 name = raw_input("What is your name? ")
 print "Hello", name
 import time
 time.sleep(2)
 if name == "Jack":
   print "Jack, I have decided that you are awesome."
   time.sleep(2)
   print "And I am a computer so I cannot be wrong"
 else:
   print "Oh, you are not Jack?"
   time.sleep(2)
   print "Haha, Jack is better than you"
 if name == "Ronan":
   print "Ronan, I know everything about you."
   time.sleep(2)
   print "For example, I know you hate cats."
 else:
   print "Oh, you are not Ronan?"
   time.sleep(2)
   print "Perhaps you can convince him that he loves cats"
 if name != "jack" and name != "Ronan":
   print "I am not wrong"

 break

 if name == "Jack":
   print "Jack, I have decided that you are awesome."
   time.sleep(2)
   print "And I am a computer so I cannot be wrong"
   continue

但你真的需要重组你的if…else语句

此外，您的循环终止逻辑也不太正确，这会更好：

while True:
    name = raw_input("What is your name? ")
    if name.lower() in ('quit', 'exit', 'end', 'bye'):
        break

    print "Hello", name
    if name == "Jack":
    .
    .
    .

至于if语句，因为每个名称都有else子句，所以泛型catch-all有点困难。您可以在末尾这样检查：

if something:
    #do something

elif otherthing:
    #do something else

else:
    #if everything above fails, do this

KNOWN_NAMES = ('Jack', 'Ronan', 'Whomever')
QUIT_VERBS = ('quit', 'q', 'exit', 'end', 'bye')

while True:
    name = raw_input("What is your name? ")
    if name.lower() in QUIT_VERBS:
        break

    if name == "Jack":
        print "Jack, I have decided that you are awesome."
        time.sleep(2)
        print "And I am a computer so I cannot be wrong"
    else:
        print "Oh, you are not Jack?"
        time.sleep(2)
        print "Haha, Jack is better than you"
    if name == "Ronan":
        # etc, etc

    if name not in KNOWN_NAMES:
        print 'I know nothing about no "%s"' % name

---

print“哈哈，杰克比你强

需要一个结束语。是的，对不起，我已经纠正了任何其他错误，但是谢谢：）