Python 3: Converting A Tuple To A String

Question

I have the following code:

var_one = var_two[var_three-1]
var_one = "string_one" + var_1

And I need to do the following to it:

var_four = 'string_two', var_one

However, this returns the following error:

TypeError: Can't convert 'tuple' object to str implicity

I have tried things such as str(var_one) and using strip but these did not work. What can I do to achieve the result I require?

EDIT - Here are what the variables contain:

var_one: new variable

var_two: tuple

var_three: integer

var_four: new

EDIT2:

The line in the program that makes the error is: os.system(var_four)

Solution 1

Your code looks fine as is.

Try running import pdb; pdb.set_trace() in your program to see if you can find the line triggering the error.

EDIT: You'll want to use ''.join(var_four) to convert var_four into a string before adding it to whatever it is you want to use it. Please note that this will actually create a new string and not overwrite var_four. See Python 3 string.join() equivalent?

Also, you should be using the subprocess module instead of os.system. See the Python 3.x documentation.

Solution 2

one_big_string = ''.join(tuple)   
print one_big_string 

Solution 3

What you've written is fine:

>>> x = 1
>>> y = 1, x
>>> 

The problem is that somewhere else in your code, you're using var_four as a string where it should be a tuple.

BTW, I think it's neater to put parentheses around tuples like this; otherwise I tend to think they're being used in tuple unpacking.

---

EDIT: There are all sorts of ways to join and format strings -- Python is good at that. In somewhat-decreasing order of generality:

"{first_thing} {second_thing}".format(first_thing=var_one, second_thing=var_two)

"{0} {1}".format(var_one, var_two)

var_one + var_two