print(",".join(str(i) for i in s))这句代码的意思
时间: 2024-04-02 19:35:56 浏览: 15
这句代码的意思是将列表s中的元素转换成字符串类型,并用逗号连接起来,最终输出一个字符串。具体来说,代码中的","表示连接符,join()是字符串的一个方法,用于将一个可迭代对象中的元素连接成一个字符串。在这里,使用了列表解析式生成了一个新的列表,其中每个元素都是s列表中的一个整数,使用str()函数将其转换成字符串类型,最后使用join()方法将它们连接成一个字符串。例如,如果s=[123, 456, 789],那么输出结果为:"123,456,789"。
相关问题
sum = eval("+".join(str(i) for i in list)) print("sum")
This code will result in a syntax error because the print statement is not properly formatted. Here is the corrected code:
sum = eval(" ".join(str(i) for i in list))
print(sum)
This code will convert the list into a string with each element separated by a space, then evaluate the resulting string as a mathematical expression and store the result in the variable sum. Finally, it will print the value of sum.
print("".join([str(i) for i in range(1, 2021)]).count("2"))
The output of this code is 601.
Explanation:
The code first creates a list of numbers from 1 to 2020 using a list comprehension: `[str(i) for i in range(1, 2021)]`. This creates a list of strings, where each string represents a number from 1 to 2020.
Then, the `join()` method is used to join all the strings in the list into a single string. The empty string `""` is used as the separator between each element in the list.
Finally, the `count()` method is used to count the number of occurrences of the digit "2" in the resulting string. This gives us the number of times the digit "2" appears in the numbers from 1 to 2020, which is 601.
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