1. 使用 `str()` 函数:
num = 42
str_num = str(num)
print(str_num) 输出:'42'
2. 使用字符串格式化操作符 `%`:
num = 42
str_num = '%d' % num
print(str_num) 输出:'42'
3. 使用 `.format()` 方法:
num = 42
str_num = '{}'.format(num)
print(str_num) 输出:'42'
4. 使用 f 字符串(Python 3.6+):
num = 42
str_num = f'{num}'
print(str_num) 输出:'42'
5. 使用字符串拼接:
num = 42
str_num = '' + str(num)
print(str_num) 输出:'42'