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Validating user input against text file

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Join Date: Nov 2008

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myself2211 myself2211 is offline

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Validating user input against text file

Nov 10th, 2008

Hi, just beginning to learn Python, and am trying to create a script that will output matches from a text file to a user's input, I have managed that so far, the problem I have is trying to have something returned if the user puts in a string of text that does not match what is in the text file. ie - number not found. I have tried 'else', but it didn't work, I think I had put it in the wrong place.

Here's where I am at -

 Help with Code Tags 
 Python Syntax (Toggle Plain Text) 
print"\nSEARCHING NUMBERS"
 
print "\nPlease Enter the Room Number 1, 2, 3, 4 or 5."
 
text_file = open("read_it.txt", "r")
 
word = raw_input("Type the Number you want to check: ")
word = word.upper()
 
print "\nnumber."
for line in text_file:
 
# if the line does not contain the typed word
# then continue to the next line
 
    if ''.join(line).find(word) == -1:continue    
    print line
print
 
if ''.join(line).find(word) != 1: 
    print line
print 
 
for line in text_file:
    print line
 
raw_input("\n\nPress the enter key to exit.")
 
text_file.close()
print"\nSEARCHING NUMBERS"

print "\nPlease Enter the Room Number 1, 2, 3, 4 or 5."

text_file = open("read_it.txt", "r")

word = raw_input("Type the Number you want to check: ")
word = word.upper()

print "\nnumber."
for line in text_file:

# if the line does not contain the typed word
# then continue to the next line

    if ''.join(line).find(word) == -1:continue    
    print line
print

if ''.join(line).find(word) != 1: 
    print line
print 

for line in text_file:
    print line

raw_input("\n\nPress the enter key to exit.")

text_file.close()

Any help/suggestions greatly appreciated.

M

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Join Date: May 2007

Posts: 311

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BearofNH

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Re: Validating user input against text file

Nov 10th, 2008

If I understand the problem, you want an else on the for loop, and do a break when you don't want it executed. Try something along these lines:

 Help with Code Tags 
 Python Syntax (Toggle Plain Text) 
for line in text_file:
 
# if the line does not contain the typed word
# then continue to the next line
 
    if ''.join(line).find(word) == -1:continue    
    print line
    break
else:
    print "Not found" # Executed whenever break above is NOT executed
print
for line in text_file:

# if the line does not contain the typed word
# then continue to the next line

    if ''.join(line).find(word) == -1:continue    
    print line
    break
else:
    print "Not found" # Executed whenever break above is NOT executed
print

If you can't do the break at that spot in the code (e.g., because you need to go thru the entire loop, not just stop at the first match) then you'll have to do a little more work, but you should be able to figure that out

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Join Date: Nov 2008

Posts: 2

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myself2211 myself2211 is offline

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Re: Validating user input against text file

Nov 10th, 2008

Thanks BearofNH, now giving it ago.
M

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Originally Posted by BearofNH

If I understand the problem, you want an else on the for loop, and do a break when you don't want it executed. Try something along these lines:
Help with Code Tags

Python Syntax (Toggle Plain Text)
for line in text_file:
 
# if the line does not contain the typed word
# then continue to the next line
 
    if ''.join(line).find(word) == -1:continue    
    print line
    break
else:
    print "Not found" # Executed whenever break above is NOT executed
print
for line in text_file: # if the line does not contain the typed word # then continue to the next line if ''.join(line).find(word) == -1:continue print line break else: print "Not found" # Executed whenever break above is NOT executed print
If you can't do the break at that spot in the code (e.g., because you need to go thru the entire loop, not just stop at the first match) then you'll have to do a little more work, but you should be able to figure that out .