How can I concatenate a string and a number in Python

Question

I was trying to concatenate a string and a number in Python  It gave me an error when I tried this    abc    9   The error is   Traceback  most recent call last     File   lt pyshell 5 gt    line 1  in  lt module gt       abc    9 TypeError  cannot concatenate  str  and  int  objects   Why I am not able to do this   How can I concatenate a string and a number in Python

User · Answer

Since Python is a strongly typed language, concatenating a string and an integer as you may do in Perl makes no sense, because there's no defined way to "add" strings and numbers to each other.

Explicit is better than implicit.

...says "The Zen of Python", so you have to concatenate two string objects. You can do this by creating a string from the integer using the built-in str() function:

>>> "abc" + str(9)
'abc9'

Alternatively use Python's string formatting operations:

>>> 'abc%d' % 9
'abc9'

Perhaps better still, use str.format():

>>> 'abc{0}'.format(9)
'abc9'

The Zen also says:

There should be one-- and preferably only one --obvious way to do it.

Which is why I've given three options. It goes on to say...

Although that way may not be obvious at first unless you're Dutch.

User · Answer

do it like this    abc s    9  or  abc    str 9

User · Answer

If it worked the way you expected it to  resulting in  abc9    what would  9    9 deliver  18 or  99    To remove this ambiguity  you are required to make explicit what you want to convert in this case    abc    str 9

User · Answer

You would have to convert the int into a string     This program calculates a workers gross pay  hours   float raw input  Enter hours worked   n     rate   float raw input  Enter your hourly rate of pay   n     gross   hours   rate  print  Your gross pay for working    str hours     at a rate of     str rate      hourly is       str gross

User · Answer

You have to convert the int into a string    abc    str 9

User · Answer

Python is strongly typed  There are no implicit type conversions   You have to do one of these    asd d    9  asd    str 9

User · Answer

Either something like this    abc    str 9    or    abs 0   format 9    or   abs d     9

[python] How can I concatenate a string and a number in Python?

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