Python字符串大小写互换练习：请求提供测试输入案例

Hey there! Let's get your Python code working properly first—right now it has a couple of syntax bugs that will prevent it from running as expected. Then I'll share a range of test inputs to help you thoroughly test the case-swap functionality.

Corrected Code #

Here's the fixed version of your code, with explanations of the changes:

def swap_case(s):
    # Added the parameter 's' so the function receives the input string
    # Changed to call the swapcase() method (needs parentheses to execute)
    return s.swapcase()

if __name__ == '__main__':
    s = input()
    result = swap_case(s)
    print(result)

The issues in your original code:

• The swap_case function didn't accept a parameter, so it couldn't access the input string s.
• You tried to assign swap_case = s.swapcase instead of calling the swapcase() method (missing parentheses) and returning the result.

Test Inputs & Expected Results #

Use these test cases to cover different scenarios—they'll help you make sure your code handles all edge cases:

• Mixed standard case:
  Input: Hello World!
  Expected Output: hELLO wORLD!
• All uppercase characters:
  Input: I AM LEARNING PYTHON
  Expected Output: i am learning python
• All lowercase characters:
  Input: python is fun
  Expected Output: PYTHON IS FUN
• With numbers and special symbols (these characters won't be affected by case swapping):
  Input: PyThOn_123!@#
  Expected Output: pYtHoN_123!@#
• Empty input (just press Enter when prompted):
  Input: Expected Output:
• String with mixed cases and extra spaces:
  Input: tHIS Is A tEST String
  Expected Output: THIS is a Test sTRING

内容的提问来源于stack exchange，提问作者ranjith sha