Using file.write() in python

Question

I just had a quick question that keeps breaking my program. For some reason file.write() will only take in 1 string or variable and my question is there any way around this?

For example Im asking if it is possible to write multiple variables or strings to a file at once. Like this but without .write() because it doesn't allow you to.

file.write("apples: ", numApples, "\n oranges: ", numOranges)

Any help or suggestions are welcome!

The best answer I thought of right now is to make it all a string then send it to the file.

file.write("apples: " + str(numApples) + "\n oranges: " + str(numOranges)) — DOOM
– DOOM, Commented Sep 27, 2014 at 18:31

venki421 · Accepted Answer · 2014-09-27 18:37:48Z

3

You can convert all the arguments to string and append them together.

For example, str(var) will convert var to string type.

You can simply use str(numApples) and so on in your case and append them using + (string concatenate) operator. The modified code will look like

file.write("apples: " + str(numApples) + "\n oranges: " + str(numOranges))

Here you have just one string argument instead of 4.

answered Sep 27, 2014 at 18:37

venki421

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2 Comments

Diesel298 Over a year ago

Its the same thing I just showed DOOM I would have to do it before the .write then send the new string there but I was wondering if there was an easier way.... Nevermind Im an idiot

Diesel298 Over a year ago

Yeah I still had the "," in there instead of the "+". Like I said stupid mistake

Tony Suffolk 66 · Accepted Answer · 2014-09-27 18:43:56Z

2

you could also use format - :

file.write("apples: {0}\n oranges: {1}".format(numApples, numOranges) )

This gives you the flexibility to add formatting to the numbers, which you don't have with the the simple string concatenation solution.

answered Sep 27, 2014 at 18:43

Tony Suffolk 66

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2 Comments

Diesel298 Over a year ago

What do you mean by that? Im still new to python so Im a little confused.

Mike DeSimone Over a year ago

For example, you can do things like file.write("apples:{0:5d}\noranges:{1:4d}".format(numApples, numOranges)) to line the numbers up.

o11c · Accepted Answer · 2014-09-27 19:44:04Z

0

Use file.writelines, which takes an iterable of strings, rather than a single string.

Or else use print(*args, file=) which takes anything and calls str() for you.

answered Sep 27, 2014 at 19:44

o11c

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Comments

rtxndr · Accepted Answer · 2014-09-27 20:02:02Z

0

You need to make one arguemnt from your strings, there are few ways to do that:

make each part a string using str(), then concatenate using a '+'
Using str.format

Using nice and concise old syntax:

file.write("apples: %s\noranges:%s" % (numApples, numOranges))

answered Sep 27, 2014 at 20:02

rtxndr

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