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To assign it to a variable, we can use the variable name and “=” operator. Normally single and double quotes are used to assign a string with a single line of character but triple quotes are used to assign a string with multi-lines of character. This is how to declare and assign a variable to a string in Python.
” operator returns Boolean True if two strings are not the same and return Boolean False if two strings are the same.
The * operator can be used to repeat the string for a given number of times. Writing two string literals together also concatenates them like + operator. If we want to concatenate strings in different lines, we can use parentheses.
This is because strings are immutable in Python.
Which means that X.replace("hello","goodbye") returns a copy of X with replacements made. Because of that you need replace this line:
X.replace("hello", "goodbye")
with this line:
X = X.replace("hello", "goodbye")
More broadly, this is true for all Python string methods that change a string's content "in-place", e.g. replace,strip,translate,lower/upper,join,...
You must assign their output to something if you want to use it and not throw it away, e.g.
X = X.strip(' \t')
X2 = X.translate(...)
Y = X.lower()
Z = X.upper()
A = X.join(':')
B = X.capitalize()
C = X.casefold()
and so on.
All string functions as lower, upper, strip are returning a string without modifying the original. If you try to modify a string, as you might think well it is an iterable, it will fail.
x = 'hello'
x[0] = 'i' #'str' object does not support item assignment
There is a good reading about the importance of strings being immutable: Why are Python strings immutable? Best practices for using them
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