Python 中的 in 關鍵字詳解：新手指南

element in iterable

fruits = ['apple', 'banana', 'cherry']
print('apple' in fruits)     # 輸出：True
print('orange' in fruits)    # 輸出：False

fruits = ['apple', 'banana', 'cherry']
print('apple' not in fruits)  # 輸出：False
print('orange' not in fruits) # 輸出：True

text = "Hello, Python!"
print('Python' in text)   # 輸出：True
print('Java' in text)     # 輸出：False

allowed_users = ['Alice', 'Bob', 'Charlie']
user = input("請輸入您的名字：")

if user in allowed_users:
    print(f"歡迎，{user}！")
else:
    print("抱歉，您沒有訪問權限。")

numbers = [1, 2, 3, 4, 5]
odd_numbers = [num for num in numbers if num % 2 != 0]
print(odd_numbers)  # 輸出：[1, 3, 5]

fruits = ['apple', 'banana', 'cherry', 'banana']
while 'banana' in fruits:
    fruits.remove('banana')
print(fruits)  # 輸出：['apple', 'cherry']

student = {'name': 'Alice', 'age': 20, 'grade': 'A'}
print('age' in student)          # 檢查鍵，輸出：True
print('Alice' in student.values()) # 檢查值，輸出：True

fruits = ['Apple', 'Banana', 'Cherry']
print('apple' in fruits)  # 輸出：False

nested_list = [[1, 2], [3, 4], [5, 6]]
print([1, 2] in nested_list)  # 輸出：True
print(1 in nested_list)       # 輸出：False

student = {'name': 'Alice', 'age': 20}
print('name' in student)      # 輸出：True
print('Alice' in student)     # 輸出：False
print('Alice' in student.values())  # 輸出：True

  fruits = ['apple', 'banana', 'cherry']
  print('apple' in)  # SyntaxError: invalid syntax

  nested_list = [[1, 2], [3, 4]]
  print(1 in nested_list)  # 輸出：False

  result = any(1 in sublist for sublist in nested_list)
  print(result)  # 輸出：True

  fruits = ['Apple', 'Banana', 'Cherry']
  fruit = 'apple'
  print(fruit.lower() in [f.lower() for f in fruits])  # 輸出：True

password = input("請輸入密碼：")
special_chars = ['!', '@', '#', '$', '%', '^', '&', '*']

if len(password) >= 8 and any(char in special_chars for char in password):
    print("密碼強度合格。")
else:
    print("密碼需要至少8個字符，且包含特殊字符。")

message = input("請輸入留言：")
banned_words = ['badword1', 'badword2', 'badword3']

if any(word in message for word in banned_words):
    print("您的留言包含不允許的詞語。")
else:
    print("留言已發布。")