CODEWITHSUNDEEP
python
Twinkle Sahni
Twinkle Sahni

Reputation: 11

How to print a string in alternating case?

I want to print a string in Python with alternate cases. For example my string is "Python". I want to print it like "PyThOn". How can I do this?

string = "Python" 
for i in string: 
  if (i%2 == 0): 
    (string[i].upper()) 
  else: 
    (string[i].lower()) 
print (string)

Upvotes: 0

Views: 7974

Answers (6)

Adon Bilivit
Adon Bilivit

Reputation: 27008

You can make good use of cycle from itertools for this problem as follows:

from itertools import cycle

def alternate(s: str) -> str:
    f = cycle((str.upper, str.lower))
    r = ""
    for c in s:
        if c.isspace():
            r += c
        else:
            r += next(f)(c)
    return r

if __name__ == "__main__":
    s = input("Please enter some text: ")
    print(alternate(s))

Upvotes: 0

cdlane
cdlane

Reputation: 41872

It's simply not Pythonic if you don't manage to include a zip() in there somehow:

from itertools import zip_longest

string = 'Pythonics'

print(''.join(x + y for x, y in zip_longest(string[0::2].upper(), string[1::2].lower(), fillvalue='')))

OUTPUT

PyThOnIcS

Upvotes: 1

Kallz
Kallz

Reputation: 3523

For random caps and small characters 

>>> def test(x):
...    return [(str(s).lower(),str(s).upper())[randint(0,1)] for s in x]
... 
>>> print test("Python")
['P', 'Y', 't', 'h', 'o', 'n']
>>> print test("Python")
['P', 'y', 'T', 'h', 'O', 'n']
>>> 
>>> 
>>> print ''.join(test("Python"))
pYthOn
>>> print ''.join(test("Python"))
PytHon
>>> print ''.join(test("Python"))
PYTHOn
>>> print ''.join(test("Python"))
PytHOn
>>>

For Your problem code is :

st = "Python"

out = ""
for i,x in enumerate(st):
    if (i%2 == 0):
        out += st[i].upper()
    else:
        out += st[i].lower()
print out

Upvotes: 1

PressingOnAlways
PressingOnAlways

Reputation: 12356

mystring="Python"
newstring=""
odd=True
for c in mystring:
  if odd:
    newstring = newstring + c.upper()
  else:
    newstring = newstring + c.lower()
  odd = not odd
print newstring

Upvotes: 1

Chris Adams
Chris Adams

Reputation: 1097

You can iterate using list comprehension, and force case depending on each character's being even or odd.

example:

s = "This is a test string"
ss = ''.join([x.lower() if i%2 else x.upper() for i,x in enumerate(s)])
print ss

s = "ThisIsATestStringWithoutSpaces"
ss = ''.join([x.lower() if i%2 else x.upper() for i,x in enumerate(s)])
print ss

output:

 ~/so_test $ python so_test.py 
ThIs iS A TeSt sTrInG
ThIsIsAtEsTsTrInGwItHoUtSpAcEs
 ~/so_test $

Upvotes: 0

amarynets
amarynets

Reputation: 1815

Try it:

def upper(word, n):
    word = list(word)
    for i in range(0, len(word), n):
        word[i] = word[i].upper()
    return ''.join(word)

Upvotes: 0

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