Python 3 int()函数未将输入字符串转换为整数 [英] Python 3 int() function is not converting input string to integer

问题描述

我正在研究一个从CSV文件读取数据的小程序.作为程序的一部分，用户输入仅用于选择> =的数据，但是在运行代码时出现 TypeError:不可排序的类型:str()> = int().看起来刺痛没有转换成整数.

I am working on a small program that reads data from a CSV file. As part of the program, user input is used to only select data that >= but I get TypeError: unorderable types: str() >= int() when I run the code. Looks like the sting is not converting to integer.

def get_csv_data(data_type, num):
    import csv
    ga_session_data = {}
    ga_pageviews_data = {}

    with open('files/data.csv', 'r') as csvfile:
        reader = csv.reader(csvfile)
        for row in reader:
            page, sessions, pageviews = row
            ga_session_data[page] = int(sessions)
            ga_pageviews_data[page] = int(pageviews)

        if data_type == 'sessions' and sessions >= int(num):
            for page, sessions in ga_session_data.items():
                print(page, ' - ', sessions)

        elif data_type == 'pageviews' and pageviews >= int(num):
            for page, pageviews in ga_pageviews_data.items():
                print(page, ' - ', pageviews)

def main():
    while(True):
        question = input("Are you interested in sessions or pageviews?")

        if question == 'sessions':
            number = int(input("What range are you interested in?"))
            get_csv_data(data_type = 'sessions', num = int(number))

        elif question == 'pageviews':
            number = input("What range are you interested in?")
            get_csv_data(data_type = 'pageviews', num = int(number))

        else:
            print("Invalid Input. Choose between sessions and pageviews.")
main()

推荐答案

int不会将其参数 cast 转换为就地整数.实际上，这些参数是不可变的.

int does not cast its parameters to integer in-place. In fact those parameters are immutable.

int(sessions)不能精确地做您认为做的事情. session未被修改，但是该调用的返回值是int.

int(sessions) does not exactly do what you think it does. session is not modified, but the return value of that call is an int.

您应该将返回的值分配给新名称/相同名称:

You should assign the returned value to a new/same name:

sessions = int(sessions)
pageviews = int(pageviews)

运算符>=现在可以比较您拥有的两个变量，因为它们现在都是整数.

The operator >= can now compare the two variables you have, since they are now both integers.

您可能还想这样重写if块:

You may also want to rewrite that if block like so:

if data_type == 'sessions':
     for page, sessions in ga_session_data.items():
         if sessions >= int(num):
             print(page, ' - ', sessions)

通过这种方式，您实际上是在检查字典中的会话计数，而不是for循环中的会话.

In this way, you're actually checking the sessions count in the dictionary and not the sessions from the for loop.

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