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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