This is a list of common string methods. In it, S is the string to which the method is applied, and s and t are other strings.
| Operation | Description |
|---|---|
| S.capitalize() | If the first character of S is a letter, capitalize it |
| S.count(s) | Count the number of times s occurs in S |
| S.endswith(s) | True if S ends with s; False otherwise |
| S.find(s) | Return the index of the first occurrence of s in S; -1 if s not in S |
| S.index(s) | Return the index of the first occurrence of s in S; ValueError exception if s not in S |
| S.isalnum() | True if S contains only alphanumerics (letters and digits); False otherwise |
| S.isalpha() | True if S contains only alphabetics (letters); False otherwise |
| S.isdigit() | True if S contains only digits; False otherwise |
| S.islower() | True if all letters in S are lower case; False otherwise |
| S.isspace() | True if S contains only white space; False otherwise |
| S.isupper() | True if all letters in S are upper case; False otherwise |
| S.lower() | Change all upper case letters in S to lower case |
| S.lstrip() | Delete all leading white space from S and return the result |
| S.replace(s,t) | Replace all occurrences of s with t in S |
| S.rfind(s) | Return the index of the last occurrence of s in S; −1 if s not in S |
| S.rindex(s) | Return the index of the last occurrence of s in S; ValueError exception if s not in S |
| S.rstrip() | Delete all trailing white space from S |
| S.strip() | Delete all leading and trailing white space from S |
| S.swapcase() | Change all upper case letters in S to lower case and all lower case letters to upper case |
| S.title() | Capitalize each word in S |
| S.upper() | Change all lower case letters in S to upper case |
This is a list of list methods. In it, L is the list to which the method is applied, M is a list, x is an element to be added to, looked for, or removed from, a list, and i is an index of a list element.
| Operation | Description |
|---|---|
| L.append(x) | Append element x to L |
| L.count(x) | Count the number of times x occurs in L |
| L.extend(M) | Extend L by adding the elements of M at the end |
| L.index(x) | Return the index of the first occurrence of x in L; ValueError exception if x not in L |
| L.insert(i,x) | Insert x at position i in L |
| L.pop() | Remove and return the last element of L |
| L.pop(i) | Remove and return the element of L at position i; IndexError exception if i out of range |
| L.remove(x) | Remove the first occurrence of x from L; ValueError exception if x not in L |
| L.reverse() | Reverse L in place (does not make a copy) |
| L.sort() | Sort L in place (does not make a copy) |
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