遍历整个列表：

For 循环：

• 使用列表项自动执行重复性任务。
• 示例： for magician in magicians: print(magician) .

magicians = ['alice', 'david', 'carolina']
 for magician in magicians:
    print(magician)

>>

alice
 david
 carolina

迭代所有项：

• Loop 检索并处理每个项目。
• 示例：在列表中打印每个魔术师的名字。

magicians = ['alice', 'david', 'carolina']
 for magician in magicians:
    print(f"{magician.title()}, that was a great trick!")

>>

 Alice, that was a great trick!
 David, that was a great trick!
 Carolina, that was a great trick!

循环执行：

• 对每个列表项重复上述步骤。
• 示例：使用循环的个性化消息。

magicians = ['alice', 'david', 'carolina']
 for magician in magicians:
    print(f"{magician.title()}, that was a great trick!")
    print(f"I can't wait to see your next trick, {magician.title()}.\n")

>>

Alice, that was a great trick!
I can't wait to see your next trick, Alice.

David, that was a great trick!
I can't wait to see your next trick, David.

Carolina, that was a great trick!
I can't wait to see your next trick, Carolina.

循环后操作：

• 循环后的代码执行一次。
• 示例：在单独消息后感谢所有魔术师。

magicians = ['alice', 'david', 'carolina']
 for magician in magicians:
    print(f"{magician.title()}, that was a great trick!")
    print(f"I can't wait to see your next trick, {magician.title()}.\n")
 print("Thank you, everyone. That was a great magic show!")


>>

Alice, that was a great trick!
 I can't wait to see your next trick, Alice.

 David, that was a great trick!
I can't wait to see your next trick, David.

 Carolina, that was a great trick!
 I can't wait to see your next trick, Carolina.

 Thank you, everyone. That was a great magic show!

避免 Python 中的缩进错误

忘记缩进：

magicians = ['alice', 'david', 'carolina']
for magician in magicians:
print(magician)  # Should be indented

#Error : 
File "magicians.py", line 3
    print(magician)
    ^
 IndentationError: expected an indented block after 'for' statement on line 2

• 错误： IndentationError: expected an indented block after 'for' statement
• 修复：缩进 print（magician） 行。

忘记缩进额外的行：

for magician in magicians:
    print(f"{magician.title()}, that was a great trick!")
print(f"I can't wait to see your next trick, {magician.title()}.\n")  # Should be indented


#OutPut

Alice, that was a great trick!
 David, that was a great trick!
 Carolina, that was a great trick!
 I can't wait to see your next trick, Carolina.

• 问题：只有最后一个魔术师会收到第二条消息，因为该行不在循环内。
• 修复：缩进第二个 print 语句。

不必要地缩进：

message = "Hello Python world!"
    print(message)  # Unnecessary indent

#Error : 

File "hello_world.py", line 2
    print(message)
    ^
 IndentationError: unexpected indent

• 错误： IndentationError: unexpected indent
• 修复：删除不必要的缩进。

在循环后缩进：

for magician in magicians:
    print(f"{magician.title()}, that was a great trick!")
    print(f"I can't wait to see your next trick, {magician.title()}.\n")
    print("Thank you everyone, that was a great magic show!")  # Should not be indented


>>

Alice, that was a great trick!
I can't wait to see your next trick, Alice.
Thank you everyone, that was a great magic show!

 David, that was a great trick!
 I can't wait to see your next trick, David.
 Thank you everyone, that was a great magic show!

 Carolina, that was a great trick!
 I can't wait to see your next trick, Carolina.
 Thank you everyone, that was a great magic show

• 问题：感谢信息是为每位魔术师打印的。
• 修复：取消缩进最后一个 print 语句。

忘记冒号：

for magician in magicians  # Missing colon
    print(magician)


#Error : 

 File "magicians.py", line 2
    for magician in magicians
                             ^
 SyntaxError: expected ':'

• 错误：语法错误：应为“：”
• 修复：在 magicians 中为 magician 添加冒号。