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List:       python-list
Subject:    Re: While, If, Count Statements
From:       Cai Gengyang <gengyangcai () gmail ! com>
Date:       2017-11-28 13:56:20
Message-ID: bb60b3e3-b6a3-4059-bfe0-0154fd47b529 () googlegroups ! com
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On Tuesday, November 28, 2017 at 8:12:09 PM UTC+8, Frank Millman wrote:
> "Cai Gengyang"  wrote in message 
> news:a8335d2c-1fb9-4ba9-b752-418d19e57b01@googlegroups.com...
> > 
> > On Tuesday, November 28, 2017 at 4:18:04 PM UTC+8, Frank Millman wrote:
> > > "Cai Gengyang"  wrote in message
> > > news:c2dfc9c4-3e16-480c-aebf-55308177510f@googlegroups.com...
> > > 
> > > > Sure, so how would the code look like if I want the "if" statement to 
> > > > be
> > > > nested inside the "while" loop
> > > 
> > > Have you tried putting the 'if' statement inside the 'while' loop?
> > > 
> > > If not, give it a shot and see what happens.
> > > 
> > > Frank Millman
> > 
> > I tried this :
> > 
> > count = 0
> > 
> > while count < 10:
> > if count < 5:
> > print "Hello, I am an if statement and count is",   count
> > print "Hello, I am a while and count is", count
> > count += 1
> > 
> > but it gives an "indentation error: expected an indented block" with an 
> > arrow pointing at the count after the 3rd statement. Indentation error is 
> > supposed to be an error about tabs and spaces right ? But I can't find any 
> > mistakes with it ...
> 
> You are almost there.
> 
> An 'if' statement always requires that the following statements are 
> indented. This applies even if you are already at one level of indentation.
> 
> You could have, for example -
> 
> if a == 'something':
> if b == 'something else':
> if c == 'and another one':
> do_something_if_a_and_b_and_c_are_true()
> 
> Or in your case -
> 
> while condition:
> if a == 'something':
> do_something_if_a_is_true()
> continue with while clause
> 
> Indentation is fundamental to the way Python works, so if anything above is 
> not clear, query it now. It is essential that you have a firm grasp of this.
> 
> HTH
> 
> Frank

It works now ! All I had to shift the 2nd "print" statement up a few spaces and it \
worked --- This is my code:

count = 0

while count < 10:
  if count < 5:
    print "Hello, I am an if statement and count is",   count
  print "Hello, I am a while and count is", count
  count += 1

Output :

Hello, I am an if statement and count is 0
Hello, I am a while and count is 0
Hello, I am an if statement and count is 1
Hello, I am a while and count is 1
Hello, I am an if statement and count is 2
Hello, I am a while and count is 2
Hello, I am an if statement and count is 3
Hello, I am a while and count is 3
Hello, I am an if statement and count is 4
Hello, I am a while and count is 4
Hello, I am a while and count is 5
Hello, I am a while and count is 6
Hello, I am a while and count is 7
Hello, I am a while and count is 8
Hello, I am a while and count is 9
-- 
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