15个高级Python技巧提高代码效率更加Pythonic

# 普通的写法
numbers = [1, 2, 3, 4, 5]
squared_numbers = []
for num in numbers:
    squared_numbers.append(num ** 2)
# 使用列表推导式
squared_numbers = [num ** 2 for num in numbers]

# 列表推导式
squared_numbers = [num ** 2 for num in numbers]
# 生成器表达式
squared_numbers = (num ** 2 for num in numbers)

# 列表推导式
squared_numbers = [num ** 2 for num in numbers]
# 生成器表达式
squared_numbers = (num ** 2 for num in numbers)

fruits = ['apple', 'banana', 'cherry']
combined_fruits = ', '.join(fruits)
print(combined_fruits)  
# Output: apple, banana, cherry

names = ['Alice', 'Bob', 'Charlie']
ages = [25, 32, 40]
for name, age in zip(names, ages):
    print(f"Name: {name}, Age: {age}")

from collections import defaultdict
fruit_counts = defaultdict(int)
fruits = ['apple', 'banana', 'cherry', 'banana']
for fruit in fruits:
    fruit_counts[fruit] += 1
print(fruit_counts)  
# Output: {'apple': 1, 'banana': 2, 'cherry': 1}

numbers = [1, 2, 3, 4, 5]
print(any(num > 3 for num in numbers))  
# Output: True
print(all(num > 3 for num in numbers))  
# Output: False

from collections import Counter
fruits = ['apple', 'banana', 'cherry', 'banana']
fruit_counts = Counter(fruits)
print(fruit_counts)  
# Output: Counter({'banana': 2, 'apple': 1, 'cherry': 1})

class MathUtils:
    @staticmethod
    def square(x):
        return x ** 2
    @classmethod
    def cube(cls, x):
        return x ** 3
print(MathUtils.square(3))  # Output: 9
print(MathUtils.cube(3))  # Output: 27

class Point:
    __slots__ = ['x', 'y']
    def __init__(self, x, y):
        self.x = x
        self.y = y

from contextlib import suppress
with suppress(FileNotFoundError):
    with open('file.txt', 'r') as file:
        contents = file.read()