如何在python中将数字替换为字符串

def replace_numbers_with_strings(input_string):
    # 将数字0-9替换为对应的字符串
    mapping = {
        '0': 'zero',
        '1': 'one',
        '2': 'two',
        '3': 'three',
        '4': 'four',
        '5': 'five',
        '6': 'six',
        '7': 'seven',
        '8': 'eight',
        '9': 'nine'
    }
    
    # 遍历输入字符串中的每个字符
    output_string = ''
    for char in input_string:
        if char.isdigit():
            # 如果字符是数字，则替换为对应的字符串
            output_string += mapping[char]
        else:
            # 如果字符不是数字，则保持原样
            output_string += char
    
    return output_string

# 示例用法
input_string = 'I have 3 apples and 2 bananas.'
output_string = replace_numbers_with_strings(input_string)
print(output_string)

I have three apples and two bananas.