write in capital letters?

Question

i have the next code:

    bestand = open("6_frame.txt", "r")
    seq = bestand.readlines()
    #to make a list
    for line in seq:
        alle = line
        while True: 
            if alle.isupper():
                break
            else:
                print ("try again ")

with this code i want to make sure that someone , who write a sequence in the file, write this sequence in capital letters, and want to except the other errors: but he want do what i want.

can somebody help me ??

German doesn't belong into sourcecode files (and this comment comes from a German). Besides that, your question is very unclear. Your loop will never exit if the line is not uppercase since the content of `alle` won't ever change. — ThiefMaster, Jan 08 '12 at 14:35
i am just wondering why bother user to make all upper. Cant you just use `alle = alle.upper()` or alike? — yosukesabai, Jan 08 '12 at 16:24
Emine, this is nonsense: you are asking to "try again" to a text file. — joaquin, Jan 09 '12 at 21:33

Adam Wagner · Answer 1 · 2012-01-08T18:48:17.960

3

I think you are saying you want to ensure the entire file is in upper-case. If that's what you are looking for, this will do the trick:

if all(x.isupper() for x in open("6_frame.txt", "r")):
    print("entire file is upper-case.")
else:
    print("try again!")

This will test the file, line-at-a-time, for all upper-case characters. If it finds a line that is not, it will return false, otherwise if all lines are upper-case, return true (and print "entire file is upper-case").

Update (File watching edition)

It looks like you want to keep checking the file until it's all uppercase. Here's a fairly ineffecient way to do it (you could add modtime checks, or use inotify to make it better):

from time import sleep

while True:
    lines = open("6_frame.txt", "r")
    if all((x.isupper() or x.isspace()) for x in lines):
        print("entire file is upper-case.")
        break  # We're done watching file, exit loop
    else:
        print("try again!")

    sleep(1)   # Wait for user to correct file

Also, you may get exceptions (I'm not sure) if the person is mid-save when your script checks the file again, so you may need to add some exception catching around the all line. Either way... Hope this helps!

edited Jan 08 '12 at 18:48

answered Jan 08 '12 at 14:48

Adam Wagner

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your code is the thing i mean , but when the code in the file is wrong, i got a lot of "try again!" and it doesn't start again ! – Emine Poyraz Jan 08 '12 at 15:05
@user1136962 I think I follow what you are looking for.. I've posted an update – Adam Wagner Jan 08 '12 at 15:50
`open()` yields lines *including* newline characters, but `"\n".isupper() is False` therefore your code doesn't work if there is a newline in the file. – jfs Jan 08 '12 at 16:50
@J.F.Sebastian, actually, it's only a problem if the newline is the *only* thing on the line. this line, for example, evaluates to true: `"FOO\n".isupper()`. I've updated my example to include lines that are *only* whitespace as well... obviously this could keep going though, what about lines with only punctuation? Either way, I think this is enough for the OP to see where to proceed from here. – Adam Wagner Jan 08 '12 at 18:50
You're right it fails only if the line doesn't contain cased characters, e.g., `"A,\n".isupper() is True` despite `",\n".isupper()` being `False`. Your code might produce different results compared to `open("6_frame.txt").read().isupper()`, but it is unclear what behavior the OP prefers. – jfs Jan 08 '12 at 19:58

score 0 · Answer 2 · answered Jan 08 '12 at 14:47

My abc.txt content is aBC, so not all uppercase:

fd = open('abc.txt','r')
seq = fd.readlines()
for line in seq:
       if line.isupper():
                  print('all capital')
       else:
                print('try again')

therefore my output = try again

if my abc.txt content is ABC my output is all capital

jfs · Answer 3 · 2012-01-08T19:56:29.053

Determine whether all cased characters in the file are uppercase, retry if not:

import time
from hashlib import md5

hprev = None
while True:
    with open("6_frame.txt") as f:
         text = f.read()
         if text.isupper():
            print('all capital')
            break
         else:
            h = md5(text).hexdigest()
            if h != hprev: # print message if the file changed
               print('try again')
            hprev = h
            time.sleep(1) # wait for the file to change

write in capital letters?

3 Answers3

Update (File watching edition)