Concatenating string and integer in Python
PythonConcatenationString ConcatenationPython Problem Overview
In Python say you have
s = "string"
i = 0
print s + i
will give you error, so you write
print s + str(i)
to not get error.
I think this is quite a clumsy way to handle int and string concatenation.
Even Java does not need explicit casting to String to do this sort of concatenation. Is there a better way to do this sort of concatenation, i.e, without explicit casting in Python?
Python Solutions
Solution 1 - Python
Modern string formatting:
"{} and {}".format("string", 1)
Solution 2 - Python
No string formatting:
>> print 'Foo',0
Foo 0
Solution 3 - Python
String formatting, using the new-style .format() method (with the defaults .format() provides):
'{}{}'.format(s, i)
Or the older, but "still sticking around", %-formatting:
'%s%d' %(s, i)
In both examples above there's no space between the two items concatenated. If space is needed, it can simply be added in the format strings.
These provide a lot of control and flexibility about how to concatenate items, the space between them etc. For details about format specifications see this.
Solution 4 - Python
Python is an interesting language in that while there is usually one (or two) "obvious" ways to accomplish any given task, flexibility still exists.
s = "string"
i = 0
print (s + repr(i))
The above code snippet is written in Python 3 syntax, but the parentheses after print were always allowed (optional) until version 3 made them mandatory.
Solution 5 - Python
The format() method can be used to concatenate a string and an integer:
print(s + "{}".format(i))
Solution 6 - Python
In Python 3.6 and newer, you can format it just like this:
new_string = f'{s} {i}'
print(new_string)
Or just:
print(f'{s} {i}')
Solution 7 - Python
If you only want to print, you can do this:
print(s, i)
Solution 8 - Python
Let's assume you want to concatenate a string and an integer in a situation like this:
for i in range(1, 11):
string = "string" + i
And you are getting a type or concatenation error.
The best way to go about it is to do something like this:
for i in range(1, 11):
print("string", i)
This will give you concatenated results, like string 1, string 2, string 3, etc.
Solution 9 - Python
You can use the an f-string too!
s = "string"
i = 95
print(f"{s}{i}")