Use this repo as cheat sheet to learn and apply Python concepts.
Changes are being made to improve it. You can review the google sheet file here. Feel free to contact me with suggestions.
- List Methods
- Tuple Methods
- Set Methods
- Dictionary Methods
- String Methods
- File Methods
- Built-in Functions
elem. = element(s) | val. = value(s) | pos. = position | dic. = dictionary | # = number(s) |
Lists
| Element | Description | Example |
|---|---|---|
| Lists | Methods | |
| List [ ] | Are mutable | Accepts duplicate elements |
| append() | Adds to end list | list.append('dog') |
| clear() | Removes all | list.clear() |
| copy() | Returns copy of list | x=list.copy() |
| count() | Returns # of elems. specified val. | x=list.count('dog') |
| extend() | Add elem. of list (or any iterable), to end of current list | list.extend(list2) |
| index() | Returns index of first elem. with specified val. | x=list.index('dog') |
| insert() | Adds elem. at specified pos. | list.insert(1, 'cat') |
| pop() | Removes elems. at specified pos. | list.pop(1) |
| remove() | Removes item with specified val. | list.remove('dog') |
| reverse() | Reverses order of list | list.reverse() |
| sort() | Sorts list | list.sort() |
Tuples
| Element | Description | Example |
|---|---|---|
| Tuples | Methods | |
| Tuple () | Are immutable | Accepts duplicate elements |
| count() | Returns # times a specified val. occurs | x=tuple.count(5) |
| index() | Searches tuple for specified val.- returns pos.where it was found | x=tuple.index(6) |
Sets
| Element | Description | Example |
|---|---|---|
| Sets | Methods | |
| Sets {} | No mutable | Doesn't accept duplicate elements |
| add() | Adds an elems. | set.add('dog') |
| clear() | Removes all elems. | fruits.clear() |
| copy() | Returns copy of set | x=fruits.copy() |
| difference() | Returns set containing difference between 2 or more sets | z=x.difference(y) |
| difference_update() | Removes items in this set that are also included in another, specified set | x.difference_update(y) |
| disdicd() | Remove specified item | fruits.disdicd('dog') |
| intersection() | Returns a set, that is intersection of two or sets | z=x.intersection(y) |
| intersection_update() | Removes items that are not present in or, specified set(s) | x.intersection_update(y) |
| isdisjoint() | Returns whether 2 sets have a intersection or not | z=x.isdisjoint(y) |
| issubset() | Returns wher another set contains this set or not | z=x.issubset(y) |
| issuperset() | Returns whether this set contains another set or not | z=x.issuperset(y) |
| pop() | Removes an elem. from set | fruits.pop() |
| remove() | Removes specified elems. | fruits.remove('dog') |
| symmetric_difference() | Returns set with symmetric differences of two sets | z=x.symmetric_difference(y) |
| symmetric_difference_update() | inserts symmetric differences from this set and another | x.symmetric_difference_update(y) |
| union() | Return a set containing union of sets | z=x.union(y) |
| update() | Update set with union of this set and others | x.update(y) |
Dictionaries
| Element | Description | Example |
|---|---|---|
| Dictionaries | Methods | |
| dicts {key: value} | Are mutable | Not duplicate keys allowed |
| clear() | Removes all elems. from dic. | dic.clear() |
| copy() | Returns a copy of dictionary | x=dic.copy() |
| fromkeys() | Returns a dictionary with specified keys and val. | thisdict = dict.fromkeys(x, y) |
| get() | Returns val. of specified key | x=dic.get("name") |
| items() | Returns a list containing a tuple for each key val. pair | x=dic.items() |
| keys() | Returns a list containing dictionary's keys | x=dic.keys() |
| pop() | Removes elems. with specified key | dic.pop("name") |
| popitem() | Removes last inserted key-val. pair | dic.popitem() |
| setdefault() | Returns val. of specified key. If key does not exist: insert key, with specified val. | x=dic.setdefault("name", "Jun") |
| update() | Updates dictionary with specified key-val. pairs | dic.update({"age": "3"}) |
| values() | Returns a list of all vals in dictionary | x=dic.values() |
Strings
| Element | Description | Example |
|---|---|---|
| Strings | Methods |
Files
| Element | Description | Example |
|---|---|---|
| Files | Methods |
Built-in Functions
| Element | Description | Example |
|---|---|---|
| Built-in Functions |
- Nefi Melgar (nefimelgarg@gmail.com)