删除字符串中间的固定字符

def remove_fixed_char(s, char):
    return s.replace(char, '')

# 示例
input_string = "hello, world!"
fixed_char = ","
result = remove_fixed_char(input_string, fixed_char)
print(result)  # 输出: hello world!

def remove_fixed_char(s, char):
    if char in s:
        return s.replace(char, '')
    else:
        print(f"字符 '{char}' 不存在于字符串中")
        return s

# 示例
input_string = "hello, world!"
fixed_char = ","
result = remove_fixed_char(input_string, fixed_char)
print(result)  # 输出: hello world!

input_string = "hello world!"
fixed_char = ","
result = remove_fixed_char(input_string, fixed_char)
# 输出: 字符 ',' 不存在于字符串中
# 输出: hello world!