CODEWITHSUNDEEP
pythonstring
Rarez
Rarez

Reputation: 129

Python how to scan string and and use upper() between two characters?

I'm a beginner so please forgive me for that question. I would like write program which magnifies letters between characters "<" and ">"

For example Input:

<html> randomchars </html>

Output:

<HTML> randomchars </HTML>

How to do that ?

I only wrote this but this magnifies all words.

while True:             
    inp = input()
    if inp == "":
        break
    elif inp =="<":
        inp=inp.upper()
        print(inp)
    else:
        print(inp)

Thanks for help.

Upvotes: 6

Views: 3433

Answers (3)

Kerem
Kerem

Reputation: 2897

Try re.sub; 

print re.sub(r"(</?\w+>)", lambda up: up.group(1).upper(), "<tag>input</tag>")

/?\w+ breakdown below, assuming you can see parenthesis () makes the group and we are trying to match between brackets <>;

  • ? will greedily match 0 or 1 repetitions of the preceding RE. Therefore, /? will match both start and finish tags.
  • \w will match any Unicode word character, including a-z, A-Z, and 0-9.
  • + will greedily match 1 or more repetitions of the preceding RE.

This will match most tags and then you can replace the tag after converting to uppercase inline using the lambda function, up.

Upvotes: 2

coder123
coder123

Reputation: 61

You want to use a regular expression to match the tags, and pass a function to modify the match. See this previous answer: Making letters uppercase using re.sub in python?

def upper_repl(match):
    return match.group(1).upper()

re.sub('(<[^>]*>)', upper_repl, '<span> <hey <annoy!>> </span>')
'<SPAN> <HEY <ANNOY!>> </SPAN>'

Upvotes: 0

Prune
Prune

Reputation: 77857

First, let's "repair" the while loop to get the continuation control out of the way. Instead of

while True:
    inp = input()
    if inp == "":
        break
    <process the input>

use

inp = input()
while inp != "":
    <process the input>
    inp = input()

Now, for the loop innards. We need to process "inp" to throw the marked characters into upper case. We also want to do this in a fashion a beginner can understand, matching the original loop flow.

You need to iterate through the characters in the input string. Set a boolean flag to tell you whether or not you're in a marked area.

    upper_area = False
    out_str = ""
    for char in inp:
        if char == '>':
            upper_area = False
        elif char == '<':
            upper_area = True
        elif upper_area:
            char = char.upper()
        out_str += char

Upvotes: 0

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