在 Python 中与 header 相加

Question

I have to write a script that does this:

Inputfile:
Name
10
-43
54
Name2
654
43
2
-5467
Name3
65
65

Outputfile:
Name 21
Name2 -4768
Name3 130

I came to the conclusion that I am supposed to split the input into arrays at the names and then print the first element and the sum of the rest, but I do not know how to do it and I haven't really found anything about this on the web.

Answer 1

Some hints:

>>> int('Name1')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: invalid literal for int() with base 10: 'Name1'
>>> int('-43')
-43

That should help you figure out what is a string and what not. It will also convert your input to a number for you.

Find out how to catch errors ( try , except ).

Find out how to read a file line by line. Try iterating over the file;)

The rest is basic programming logic. Figuring it out yourself will give you most bang for the buck.

Answer 2

Open the files and use readline to open the files line by line. Check whether it is string or not. By looking at your file format, I assume everything in between two strings (Name1 and Name2 or else) are numbers so store those on list. Finally use sum(list) to get the output. I am not writing the code since this is "HOMEWORK".

Answer 3

Iterate over the file line by line using

for line in open('test.txt'):
    # do stuff

When you find a name you need to start adding each number to a sum until you encounter until you find a different name when you start to sum the numbers again from zero.