print variable and a string in python

Question

Alright, I know how to print variables and strings. But how can I print something like "My string" card.price (it is my variable). I mean, here is my code: print "I have " (and here I would like to print my variable card.price).

Solution 1

By printing multiple values separated by a comma:

print "I have", card.price

The print statement will output each expression separated by spaces, followed by a newline.

If you need more complex formatting, use the ''.format() method:

print "I have: {0.price}".format(card)

or by using the older and semi-deprecated % string formatting operator.

Solution 2

Something that (surprisingly) hasn't been mentioned here is simple concatenation.

Example:

foo = "seven"

print("She lives with " + foo + " small men")

Result:

She lives with seven small men

Additionally, as of Python 3, the % method is deprecated. Don't use that.

Solution 3

If you are using python 3.6 and newer then you can use f-strings to do the task like this.

print(f"I have {card.price}")

just include f in front of your string and add the variable inside curly braces { }.

Refer to a blog The new f-strings in Python 3.6: written by Christoph Zwerschke which includes execution times of the various method.

Solution 4

Assuming you use Python 2.7 (not 3):

print "I have", card.price (as mentioned above).

print "I have %s" % card.price (using string formatting)

print " ".join(map(str, ["I have", card.price])) (by joining lists)

There are a lot of ways to do the same, actually. I would prefer the second one.

Solution 5

From what I know, printing can be done in many ways

Here's what I follow:

Printing string with variables

a = 1
b = "ball"
print("I have", a, b)

Versus printing string with functions

a = 1
b = "ball"
print("I have" + str(a) + str(b))

In this case, str() is a function that takes a variable and spits out what its assigned to as a string

They both yield the same print, but in two different ways. I hope that was helpful

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Comments

[s1lence]

what about the possibility of format strings and basic string concatenation? Could extend your answer in a nice way showing different approaches for different purposes.

[alexvassel]

@Martijn Pieters: I was nanosecond first with format answer)

[Martijn Pieters]

@alexvassel: But mine contains documentation links, a better example, and points to % string formatting too. :-P

[alexvassel]

@Martijn Pieters: True things for sure) Deleting my answer.

[user203558]

Is it okay even if the result is not string but a number??

[yantrab]

"semi-deprecated": it isn't deprecated, semi- or otherwise.

[Martijn Pieters]

@NedBatchelder: There has been deprecation 'noise' about it, I know it's not deprecated now but it is clear .format() is to be preferred.

[Ignacio Ara]

Please explain your lines of code so other users can understand its functionality

[jww]

Screw F-strings. They break on both Python2 and Python3. The Python devs should get a Darwin award for breaking basic I/O yet again.

[Vignesh Krishnan]

This feature was introduced in python 3.6. it would obviously break if you use it on earlier python releases. don't use them if you are using legacy python. you can use the good old format().

[Admin]

Works fine :) for a multiple var injection (with outfile print ) : print("SELECT mot FROM " + choixL + " WHERE mot LIKE " + mot + ";", file=open("verif.sql", "a"))

[forresthopkinsa]

@NuX_o Be careful not to let any user input into those fields!

[tripleee]

This only works if the variable you want to interpolate is a string, though.

[tripleee]

Nothing here is specific to Python 3.6.1, though the output will look weird in Python 2.