CODEWITHSUNDEEP
pythonstringuppercase
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Reputation: 347

how to change the case of first letter of a string?

s = ['my', 'name']

I want to change the 1st letter of each element in to Upper Case.

s = ['My', 'Name']

Upvotes: 33

Views: 43967

Answers (5)

martineau
martineau

Reputation: 123393

It probably doesn't matter, but you might want to use this instead of the capitalize() or title() string methods because, in addition to uppercasing the first letter, they also lowercase the rest of the string (and this doesn't): 

s = map(lambda e: e[:1].upper() + e[1:] if e else '', s)

Note: In Python 3, you'd need to use:

s = list(map(lambda e: e[:1].upper() + e[1:] if e else '', s))

because map() returns an iterator that applies function to every item of iterable instead of a list as it did in Python 2 (so you have to turn it into one yourself).

Upvotes: 6

Frédéric Hamidi
Frédéric Hamidi

Reputation: 262919

You can use the capitalize() method:

s = ['my', 'name']
s = [item.capitalize() for item in s]
print s  # print(s) in Python 3

This will print:

['My', 'Name']

Upvotes: 30

Per Mejdal Rasmussen
Per Mejdal Rasmussen

Reputation: 985

Both .capitalize() and .title(), changes the other letters in the string to lower case.

Here is a simple function that only changes the first letter to upper case, and leaves the rest unchanged.

def upcase_first_letter(s):
    return s[0].upper() + s[1:]

Upvotes: 57

Kracekumar
Kracekumar

Reputation: 20419

You can use

for i in range(len(s)):
   s[i]=s[i].capitalize()
print s

Upvotes: 0

Frank
Frank

Reputation: 10571

You can use 'my'.title() which will return 'My'.

To get over the complete list, simply map over it like this:

>>> map(lambda x: x.title(), s)
['My', 'Name']

Actually, .title() makes all words start with uppercase. If you want to strictly limit it the first letter, use capitalize() instead. (This makes a difference for example in 'this word' being changed to either This Word or This word)

Upvotes: 14

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