# 基本for循環
for i in range(5):
    print(i)  # 輸出：0, 1, 2, 3, 4

# 遍歷字符串
for char in "Python":
    print(char)  # 輸出：P, y, t, h, o, n

# 遍歷列表
fruits = ["蘋果", "香蕉", "橘子"]
for fruit in fruits:
    print(fruit)

注意事項：

• 循環體必須縮進
• range()函數生成的序列從0開始
• 可以遍歷任何可迭代對象

# range(stop)
for i in range(3):
    print(i)  # 0, 1, 2

# range(start, stop)
for i in range(1, 4):
    print(i)  # 1, 2, 3

# range(start, stop, step)
for i in range(0, 10, 2):
    print(i)  # 0, 2, 4, 6, 8

# 計算1到10的總和
total = 0
for i in range(1, 11):
    total += i
print(f"總和為：{total}")  # 55

# 打印九九乘法表
for i in range(1, 10):
    for j in range(1, 10):
        print(f"{i}×{j}={i*j}t", end="")
    print()

# 統計字符串中的大寫字母
text = "Hello Python World"
count = 0
for char in text:
    if char.isupper():
        count += 1
print(f"大寫字母數量：{count}")  # 3

# 同時獲取索引和值
fruits = ["蘋果", "香蕉", "橘子"]
for index, fruit in enumerate(fruits):
    print(f"第{index+1}個水果是：{fruit}")

# break示例
for i in range(5):
    if i == 3:
        break
    print(i)  # 輸出：0, 1, 2

# continue示例
for i in range(5):
    if i == 2:
        continue
    print(i)  # 輸出：0, 1, 3, 4