I am new and trying to find a way to insert a number of L's at the beginning and end of a string. So if I have a string which says
"where did I put my cupcake this morning"
And I want to insert 1 L at the start and 2 L's at the end, so it looks like: "Lwhere did I put my cupcake this morningLL" How do I do this. thank you
Strings are immutable so you can't insert characters into an existing string. You have to create a new string. You can use string concatenation to do what you want:
yourstring = "L" + yourstring + "LL"
Note that you can also create a string with n Ls by using multiplication:
m = 1
n = 2
yourstring = ("L" * m) + yourstring + ("L" * n)
You can also use join:
yourstring = ''.join(('L','yourstring','LL'))
Result:
>>> yourstring
'LyourstringLL'
"hi".join(["hello","goodbye"]) will become hihello and finally return hihellogoodbye. In Akavall's answer, an empty string is used in the place of "hi". The join function needs to be able to iterate over what you give it, so you need to put them in an iterable. If you omit the paretheses, you are just giving it three separate strings as arguments.For completeness along with the other answers:
yourstring = "L%sLL" % yourstring
Or, more forward compatible with Python 3.x:
yourstring = "L{0}LL".format(yourstring)
If you want to insert other string somewhere else in existing string, you may use selection method below.
Calling character on second position:
>>> s = "0123456789"
>>> s[2]
'2'
Calling range with start and end position:
>>> s[4:6]
'45'
Calling part of a string before that position:
>>> s[:6]
'012345'
Calling part of a string after that position:
>>> s[4:]
'456789'
Inserting your string in 5th position.
>>> s = s[:5] + "L" + s[5:]
>>> s
'01234L56789'
Also s is equivalent to s[:].
With your question you can use all your string, i.e.
>>> s = "L" + s + "LL"
or if "L" is a some other string (for example I call it as l), then you may use that code:
>>> s = l + s + (l * 2)
Adding to C2H5OH's answer, in Python 3.6+ you can use format strings to make it a bit cleaner:
s = "something about cupcakes"
print(f"L{s}LL")
you can use f strings for this
foo = "where did I put my cupcake this morning"
bar = 'L'
foobar = f'{bar*10}{foo}'
print(foobar)
you can replace 10 by how many times you want to put L's in your string
for end also you can do the same
foo = "where did I put my cupcake this morning"
bar = 'L'
foobar = f'{bar*10}{foo}{bar*10}'
print(foobar)
Let's say we have a string called yourstring:
for x in range(0, [howmanytimes you want it at the beginning]):
yourstring = "L" + yourstring
for x in range(0, [howmanytimes you want it at the end]):
yourstring += "L"
You can easily prepend and append strings by using f-strings:
text = "where did I put my cupcake this morning"
prepend = "L"
append = "LL"
print(f"{prepend}{text}{append}")
# Result: "Lwhere did I put my cupcake this morningLL"
Or you can build a function that gives you more flexibility:
def prepend_and_append(text: str, prepend_char: str, prepend_times: int, append_char: str, append_times: int) -> str:
return f"{prepend_char * prepend_times}{text}{append_char * append_times}"
print(prepend_and_append(text, "L", 1, "L", 2))
# Result: "Lwhere did I put my cupcake this morningLL"
