如何替换字符串中的特定字符

# 替换字符串中的特定字符
def replace_char(string, old_char, new_char):
    return string.replace(old_char, new_char)

# 示例用法
string = "Hello, World!"
old_char = ","
new_char = " "
result = replace_char(string, old_char, new_char)
print(result)