如何将整数写入文件

Question

I need to write

ranks[a], ranks[b], count

to a file, each time on a new line

I am using:

file = open("matrix.txt", "w")
for (a, b), count in counts.iteritems():
    file.write(ranks[a], ranks[b], count)

file.close()

but this is not working and returns

TypeError: function takes exactly 1 argument (3 given)

Answer 1

As the error says, file.write only takes one arg. Try:

file.write("%s %s %s" % (ranks[a], ranks[b], count))

Answer 2

Hamish's answer is correct. But when you would be reading the contents back you would be reading them as strings and not as integers . So if you'd want to read them back as integers or as any other dataType, then I would suggest using some kind of object serialization like pickle .
For pickle -ing your data, you should read this page in the official documentation. For your convenience, I am pasting a snippet from here :

# Save a dictionary into a pickle file.
import pickle
favorite_color = { "lion": "yellow", "kitty": "red" }
pickle.dump( favorite_color, open( "save.p", "wb" ) )

# Load the dictionary back from the pickle file.
import pickle
favorite_color = pickle.load( open( "save.p", "rb" ) )
# favorite_color is now { "lion": "yellow", "kitty": "red" }

Answer 3

It sounds like you want a variation on the print statement.

Python 2.x:

print >> file, ranks[a], ranks[b], count

Python 3.x:

print(ranks[a], ranks[b], count, file=file)

The advantage of the print statement over the file.write solution proposed above is that you don't have to worry about those pesky newlines.