Python sum函数使用教程 - 详解与实例 | Python编程指南

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sum(iterable, start=0)

numbers = [1, 2, 3, 4, 5]
result = sum(numbers)
print(result)  # 输出：15

numbers = [10, 20, 30]
result = sum(numbers, 100)
print(result)  # 输出：160

# 元组求和
tuple_data = (5, 10, 15)
print(sum(tuple_data))  # 输出：30

# 集合求和
set_data = {2, 4, 6, 8}
print(sum(set_data))    # 输出：20

prices = [12.99, 3.49, 7.99, 2.50]
total = sum(prices)
print(f"总价格: ${total:.2f}")  # 输出：总价格: $26.97

# 计算1到100的偶数和
even_sum = sum(i for i in range(1, 101) if i % 2 == 0)
print(even_sum)  # 输出：2550

nested_list = [[1, 2, 3], [4, 5], [6, 7, 8, 9]]
total = sum(sum(inner_list) for inner_list in nested_list)
print(total)  # 输出：45

words = ["Hello", " ", "World"]
# 错误用法：total = sum(words)  # 会引发TypeError

sentence = ''.join(words)
print(sentence)  # 输出：Hello World

empty_list = []
result = sum(empty_list)
print(result)  # 输出：0

result_with_start = sum(empty_list, 10)
print(result_with_start)  # 输出：10