filter(function, iterable)

# 定義一個(gè)函數(shù)，判斷是否為偶數(shù)
def is_even(num):
    return num % 2 == 0
    # 待篩選的列表
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
# 使用filter函數(shù)過(guò)濾出偶數(shù)
filtered_numbers = filter(is_even, numbers)
# 將filter的結(jié)果轉(zhuǎn)換為列表
result = list(filtered_numbers)
print(result)  # 輸出: [2, 4, 6, 8, 10]

# 待篩選的列表
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
# 使用Lambda表達(dá)式過(guò)濾出偶數(shù)
filtered_numbers = filter(lambda x: x % 2 == 0, numbers)
# 將filter的結(jié)果轉(zhuǎn)換為列表
result = list(filtered_numbers)
print(result)  # 輸出: [2, 4, 6, 8, 10]

# 待篩選的列表
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
# 使用Lambda表達(dá)式過(guò)濾出偶數(shù)
filtered_numbers = filter(lambda x: x % 2 == 0, numbers)
# 轉(zhuǎn)換為列表
result_list = list(filtered_numbers)
print(result_list)  # 輸出: [2, 4, 6, 8, 10]
# 再次嘗試訪問(wèn)迭代器中的元素將為空
for num in filtered_numbers:
    print(num)  # 不會(huì)輸出任何內(nèi)容

# 定義一個(gè)函數(shù)，判斷兩個(gè)數(shù)之和是否為偶數(shù)
def sum_is_even(a, b):
    return (a + b) % 2 == 0
    # 待篩選的列表
numbers1 = [1, 2, 3, 4, 5]
numbers2 = [10, 20, 30, 40, 50]
# 使用filter函數(shù)過(guò)濾出兩個(gè)數(shù)之和為偶數(shù)
filtered_numbers = filter(sum_is_even, numbers1, numbers2)
# 將filter的結(jié)果轉(zhuǎn)換為列表
result = list(filtered_numbers)
print(result)  # 輸出: [3, 5]

# 待篩選的列表，包含一些空字符串和非空字符串
words = ["hello", "", "world", " ", "python", ""]
# 使用filter函數(shù)過(guò)濾掉空字符串
filtered_words = filter(None, words)
# 將filter的結(jié)果轉(zhuǎn)換為列表
result = list(filtered_words)
print(result)  # 輸出: ["hello", "world", " ", "python"]

# 待篩選的字典列表，每個(gè)字典包含姓名和年齡信息
people = [
    {"name": "Alice", "age": 25},
    {"name": "Bob", "age": 17},
    {"name": "Charlie", "age": 19},
    {"name": "David", "age": 15},
    {"name": "Eva", "age": 22},
]
# 定義一個(gè)函數(shù)，判斷是否為成年人（年齡大于等于18歲）
def is_adult(person):
    return person["age"] >= 18
# 使用filter函數(shù)過(guò)濾出成年人
adults = filter(is_adult, people)
# 將filter的結(jié)果轉(zhuǎn)換為列表
adults_list = list(adults)
print(adults_list)  # 輸出: [{'name': 'Alice', 'age': 25}, {'name': 'Charlie', 'age': 19}, {'name': 'Eva', 'age': 22}]