continue problem

[pythonner]

Hi folks,

I'm working my way through "How to Think Like a Computer Scientist Learning with Python" from this link:
http://www.greenteapress.com/thinkpy...ml/chap20.html.

In 'The animal tree" program I keep getting a " 'continue' not properly in loop" error. It's coming from the "make a guess" section of the code:

# make a guess
    guess = tree.getCargo()
    prompt = "Is it a " + guess + "? "
    if yes(prompt):
      print "I rule!"
      continue 

Isn't this incorrect coding in the first place? Isn't continue only used in "for" and "while" loops? That's what I've read in the Python Tutorial. I've tried "break" and "pass" in place of "continue", but none of those work either. How do I get the program to continue on to the next prompt ""What is the animal's name? " ?

Thanks

[bvdet]

Hi folks,

I'm working my way through "How to Think Like a Computer Scientist Learning with Python" from this link:
www.greenteapress.com/thinkpython/thinkCSpy/html/chap20.html.

In 'The animal tree" program I keep getting a " 'continue' not properly in loop" error. It's coming from the "make a guess" section of the code:

# make a guess
    guess = tree.getCargo()
    prompt = "Is it a " + guess + "? "
    if yes(prompt):
      print "I rule!"
      continue 

Isn't this incorrect coding in the first place? Isn't continue only used in "for" and "while" loops? That's what I've read in the Python Tutorial. I've tried "break" and "pass" in place of "continue", but none of those work either. How do I get the program to continue on to the next prompt ""What is the animal's name? " ?

Thanks

'continue' is used to jump to the next iteration of a loop, skipping the remaining code in the loop body. I do not see a loop in your code.

[ghostdog74]

Hi folks,

I'm working my way through "How to Think Like a Computer Scientist Learning with Python" from this link:
www.greenteapress.com/thinkpython/thinkCSpy/html/chap20.html.

In 'The animal tree" program I keep getting a " 'continue' not properly in loop" error. It's coming from the "make a guess" section of the code:

# make a guess
    guess = tree.getCargo()
    prompt = "Is it a " + guess + "? "
    if yes(prompt):
      print "I rule!"
      continue 

Isn't this incorrect coding in the first place? Isn't continue only used in "for" and "while" loops? That's what I've read in the Python Tutorial. I've tried "break" and "pass" in place of "continue", but none of those work either. How do I get the program to continue on to the next prompt ""What is the animal's name? " ?

Thanks

read the whole code carefully in that link you gave. there are a number of while loops ....

[bartonc]

Hi folks,

I'm working my way through "How to Think Like a Computer Scientist Learning with Python" from this link:
http://www.greenteapress.com/thinkpy...ml/chap20.html.

In 'The animal tree" program I keep getting a " 'continue' not properly in loop" error. It's coming from the "make a guess" section of the code:

# make a guess
    guess = tree.getCargo()
    prompt = "Is it a " + guess + "? "
    if yes(prompt):
      print "I rule!"
      continue 

Isn't this incorrect coding in the first place? Isn't continue only used in "for" and "while" loops? That's what I've read in the Python Tutorial. I've tried "break" and "pass" in place of "continue", but none of those work either. How do I get the program to continue on to the next prompt ""What is the animal's name? " ?

Thanks

The link is approved! In fact, i think that somebody aught to add Green Tea Press to one of the Python Resource threads. (Unless, of course, all their code is really broken:<)



Please post more of the code that you have. There is a possibility that you have a copy&paste error, or something.

[pythonner]

Okay, here's the complete code. I didn't cut-and-paste, I typed this out, straight from the web site. My point is, I don't think the "continue" statement belongs in an "if" block. Am I right, or not? Because everytime I run the program I get a 'continue' not properly in loop" error.

def animal():
    # start with a singleton
    root = Tree("bird")
 
    # loop until the user quits
    while 1:
        print
        if not yes("Are you thinking of an animal? "): break
 
    # walk the tree
    tree = root
    while tree.getLeft() != None:
        prompt = tree.getCargo() + "? "
        if yes(prompt):
            tree = tree.getRight()
        else:
            tree = tree.getLeft()
 
    # make a guess
    guess = tree.getCargo()
    prompt = "Is it a " + guess + "? "
    if yes(prompt):
        print "I rule!"
        continue
 
    # get new information
    prompt = "What is the animal's name? "
    animal = raw_input(prompt)
    prompt = "What question would distinguish a %s from a %s? "
    question = raw_input(prompt % (animal, guess))
 
    # add new information to the tree
    tree.setCargo(question)
    prompt = "If the animal were %s the answer would be? "
    if yes(prompt % animal):
        tree.setLeft(Tree(guess))
        tree.setRight(Tree(animal))
    else:
        tree.setLeft(Tree(animal))
        tree.setRight(Tree(guess))
 
def yes(ques):
    from string import lower
    ans = lower(raw_input(ques))
    return (ans[0] == 'y')
 

[bvdet]

Okay, here's the complete code. I didn't cut-and-paste, I typed this out, straight from the web site. My point is, I don't think the "continue" statement belongs in an "if" block. Am I right, or not? Because everytime I run the program I get a 'continue' not properly in loop" error.

def animal():
    # start with a singleton
    root = Tree("bird")
 
    # loop until the user quits
    while 1:
        print
        if not yes("Are you thinking of an animal? "): break
 
    # walk the tree
    tree = root
    while tree.getLeft() != None:
        prompt = tree.getCargo() + "? "
        if yes(prompt):
            tree = tree.getRight()
        else:
            tree = tree.getLeft()
 
    # make a guess
    guess = tree.getCargo()
    prompt = "Is it a " + guess + "? "
    if yes(prompt):
        print "I rule!"
        continue
 
    # get new information
    prompt = "What is the animal's name? "
    animal = raw_input(prompt)
    prompt = "What question would distinguish a %s from a %s? "
    question = raw_input(prompt % (animal, guess))
 
    # add new information to the tree
    tree.setCargo(question)
    prompt = "If the animal were %s the answer would be? "
    if yes(prompt % animal):
        tree.setLeft(Tree(guess))
        tree.setRight(Tree(animal))
    else:
        tree.setLeft(Tree(animal))
        tree.setRight(Tree(guess))
 
def yes(ques):
    from string import lower
    ans = lower(raw_input(ques))
    return (ans[0] == 'y')
 

The continue() statement is used in a loop as I posted earlier. The code you typed in has an indentation error.

[varuns]

The continue() statement is used in a loop as I posted earlier. The code you typed in has an indentation error.

Bvdet is Correct.
Try prefixing tab on following lines

#
# make a guess
    guess = tree.getCargo()
    prompt = "Is it a " + guess + "? "
    if yes(prompt):
        print "I rule!"
        continue
 
    # get new information
    prompt = "What is the animal's name? "
    animal = raw_input(prompt)
    prompt = "What question would distinguish a %s from a %s? "
    question = raw_input(prompt % (animal, guess))
 
    # add new information to the tree
    tree.setCargo(question)
    prompt = "If the animal were %s the answer would be? "
    if yes(prompt % animal):
        tree.setLeft(Tree(guess))
        tree.setRight(Tree(animal))
    else:
        tree.setLeft(Tree(animal))
 
        tree.setRight(Tree(guess))