将 len() 转换为字符串连接表达式中的字符串值

Question

如何将len()值转换为字符串以成功打印字符串表达式？

vacation = ['Rick', 'Paris', 'Tom', 'James']
print("I live with " + len(vacation) + " people")

我收到错误

Traceback (most recent call last):
  File "<pyshell#30>", line 1, in <module>
   print("I live with " + len(vacation) + " people")
TypeError: must be str, not int

Answer 1

使用 str 函数将 int 转换为字符串：

print("I live with " + str(len(vacation)) + " people")

Answer 2

对于此类任务，使用格式化字符串是比将小块与+连接在一起要方便得多

vacation = ['Rick', 'Paris', 'Tom', 'James']
print("I live with %d people" % len(vacation))

Answer 3

你可以

这样做：

print("I live with %s people" % len(vacation))

或

print('I live with {} people'.format(len(vacation)))

%s 和 {} 是传递的参数的占位符。

Answer 4

使用 str 函数。

假期 = ["里克"、"巴黎"、"汤姆"、"詹姆斯"]

print("I Live With " + str(len(vacation(( + "people"(

Answer 5

vacation = ['Rick', 'Paris', 'Tom', 'James']
print(f"I live with {len(vacation)} people")

https://docs.python.org/3/reference/lexical_analysis.html 了解更多信息。