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July 28, 2024 20:59
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Python Cheatsheet
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| # List Comprehensions | |
| squares = [x**2 for x in range(10)] | |
| even_squares = [x**2 for x in range(10) if x % 2 == 0] | |
| # Dictionary Comprehensions | |
| squared_dict = {x: x**2 for x in range(10)} | |
| # Lambda Functions | |
| add = lambda a, b: a + b | |
| # List Methods | |
| lst = [1, 2, 3, 4] | |
| lst.append(5) | |
| lst.remove(3) | |
| lst.sort(reverse=True) | |
| lst.reverse() | |
| # Dictionary Methods | |
| d = {'key1': 'value1', 'key2': 'value2'} | |
| d.update({'key3': 'value3'}) | |
| value = d.get('key1', 'default') | |
| keys = d.keys() | |
| values = d.values() | |
| items = d.items() | |
| # Set Methods | |
| s = {1, 2, 3, 4} | |
| s.add(5) | |
| s.remove(3) | |
| union = s.union({6, 7}) | |
| intersection = s.intersection({2, 3}) | |
| difference = s.difference({1, 2}) | |
| # String Methods | |
| s = "hello world" | |
| s_upper = s.upper() | |
| s_lower = s.lower() | |
| s_replace = s.replace("world", "Python") | |
| s_split = s.split() | |
| s_find = s.find("hello") | |
| s_count = s.count("l") | |
| # Map, Filter, Reduce | |
| from functools import reduce | |
| mapped = list(map(lambda x: x*2, [1, 2, 3])) | |
| filtered = list(filter(lambda x: x > 1, [1, 2, 3])) | |
| reduced = reduce(lambda x, y: x + y, [1, 2, 3]) | |
| # Enumerate | |
| for index, value in enumerate(['a', 'b', 'c']): | |
| print(index, value) | |
| # List Slicing | |
| lst = [1, 2, 3, 4, 5] | |
| sub_lst = lst[1:3] | |
| rev_lst = lst[::-1] | |
| # Advanced Functions | |
| def my_function(p1, p2="default"): | |
| """Function Documentation""" | |
| return p1 + p2 | |
| # Generators | |
| def my_generator(): | |
| for i in range(10): | |
| yield i | |
| # Context Managers | |
| with open('file.txt', 'r') as file: | |
| data = file.read() | |
| # Exception Handling | |
| try: | |
| x = 1 / 0 | |
| except ZeroDivisionError: | |
| print("Cannot divide by zero") | |
| finally: | |
| print("This always executes") | |
| # Modules | |
| import math | |
| import random | |
| import itertools | |
| # Math | |
| sqrt = math.sqrt(16) | |
| fact = math.factorial(5) | |
| # Random | |
| randint = random.randint(1, 10) | |
| choice = random.choice([1, 2, 3, 4]) | |
| # Itertools | |
| permutations = list(itertools.permutations([1, 2, 3])) | |
| combinations = list(itertools.combinations([1, 2, 3], 2)) | |
| product = list(itertools.product([1, 2], repeat=2)) |
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