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The str() function in python is used to turn a value into a string. The simple answer to what the str() does to a list is that it creates a string representation of the list (square brackets and all).
Python Find String in List using count() We can also use count() function to get the number of occurrences of a string in the list. If its output is 0, then it means that string is not present in the list. l1 = ['A', 'B', 'C', 'D', 'A', 'A', 'C'] s = 'A' count = l1.
The easiest way to check if a Python string contains a substring is to use the in operator. The in operator is used to check data structures for membership in Python. It returns a Boolean (either True or False ).
Definition and UsageThe startswith() method returns True if the string starts with the specified value, otherwise False.
str.startswith allows you to supply a tuple of strings to test for:
if link.lower().startswith(("js", "catalog", "script", "katalog")):
From the docs:
str.startswith(prefix[, start[, end]])Return
Trueif string starts with theprefix, otherwise returnFalse.prefixcan also be a tuple of prefixes to look for.
Below is a demonstration:
>>> "abcde".startswith(("xyz", "abc"))
True
>>> prefixes = ["xyz", "abc"]
>>> "abcde".startswith(tuple(prefixes)) # You must use a tuple though
True
>>>
You can also use any(), map() like so:
if any(map(l.startswith, x)):
pass # Do something
Or alternatively, using a generator expression:
if any(l.startswith(s) for s in x)
pass # Do something
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