Question

a01:01-24-2011:s1 
a03:01-24-2011:s2 
a02:01-24-2011:s2 
a03:02-02-2011:s2 
a03:03-02-2011:s1 
a02:04-19-2011:s2 
a01:05-14-2011:s2 
a02:06-11-2011:s2 
a03:07-12-2011:s1 
a01:08-19-2011:s1 
a03:09-19-2011:s1 
a03:10-19-2011:s2 
a03:11-19-2011:s1 
a03:12-19-2011:s2

所以我把这个数据列表作为txt文件，where animal name : date : location 所以我必须阅读这个txt文件来回答问题。

所以到目前为止我已经

了

text_file=open("animal data.txt", "r") #open the text file and reads it.

我知道怎么读一行，但是这里因为有多行我不知道如何读取txt中的每一行。

Answer 1

使用for循环。

text_file = open("animal data.txt","r")
for line in text_file:
    line = line.split(":")
    #Code for what you want to do with each element in the line
text_file.close()

Answer 2

由于您知道此文件的格式，因此您可以将其缩短到其他答案：

with open('animal data.txt', 'r') as f:
    for line in f:
        animal_name, date, location = line.strip().split(':')
        # You now have three variables (animal_name, date, and location)
        # This loop will happen once for each line of the file
        # For example, the first time through will have data like:
        #     animal_name == 'a01'
        #     date == '01-24-2011'
        #     location == 's1'

或者，如果您想保留从文件中获取的信息数据库以回答您的问题，您可以执行以下操作：

animal_names, dates, locations = [], [], []

with open('animal data.txt', 'r') as f:
    for line in f:
        animal_name, date, location = line.strip().split(':')
        animal_names.append(animal_name)
        dates.append(date)
        locations.append(location)

# Here, you have access to the three lists of data from the file
# For example:
#     animal_names[0] == 'a01'
#     dates[0] == '01-24-2011'
#     locations[0] == 's1'

Answer 3

如果with失败，您可以使用open语句打开文件。

>>> with open('data.txt', 'r') as f_in:
>>>     for line in f_in:
>>>         line = line.strip() # remove all whitespaces at start and end
>>>         field = line.split(':')
>>>         # field[0] = animal name
>>>         # field[1] = date
>>>         # field[2] = location

Answer 4

您错过了关闭文件。您最好使用with语句来确保文件关闭。

with open("animal data.txt","r") as file:
    for line in file:
        line = line.split(":")
        # Code for what you want to do with each element in the line

使用python读取txt文件并回答问题

4 个答案: