CODEWITHSUNDEEP
python
daydreamer
daydreamer

Reputation: 92099

How do I add a string and an int object in Python?

What do I need?

I have SQL content like:

('a', 1),

So I do:

return_string = '('
    for column in columns:
        return_string += "'" + column + "', "
    return_string = return_string[:-2] + '),'
    return return_string

But it fails with the same error.

>>> a = 'a'
>>> a + 1
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: cannot concatenate 'str' and 'int' objects
>>> 1 + "1"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for +: 'int' and 'str'
>>>

However, if I convert an int into a string, everything works and I get:

('a', '1'),

But I need

('a', 1),

where 1 is unquoted '

Upvotes: 1

Views: 1199

Answers (4)

Ahmed Abdulahi Ibrahim Ahmedba
Ahmed Abdulahi Ibrahim Ahmedba

Reputation: 1

class StrInt:

    def __init__(self, strin, inte):

        self.strin = strin
        self.inte = inte
    def add(self, a, b):

       self.strin = a
       self.inte = b
       wordNum =  f"{a} {b}"
       print(wordNum)

strInt = StrInt("Word", 2)
 
strInt.add(120, "cars") 

print(type(strInt)

How many word are we talking about. I came up class which adds a word and a number using f". The function in the class adds a word and and integer.

Upvotes: -1

Victor Duarte da Silva
Victor Duarte da Silva

Reputation: 68

You can create a function to represent your type correctly:

def toStr(x):
    if isinstance(x, int):
        return str(x)
    #another elif for others types
    else:
        return "'"+x+"'"

And use

myTuple = ('a', 1, 2, 5)
print "("+", ".join(toStr(x) for x in myTuple)+")"

to print in the correct format.

Upvotes: 1

mhlester
mhlester

Reputation: 23251

It finally clicked what you want and what your input is! It's for arbitrary length columns object! Here you go:

return_string = "(" + ', '.join((repr(column) for column in columns)) + ")"

Output is exactly as requested:

('a', 1)

All previous answers (including my deleted one), were assuming a fixed two-item input. But reading your code (and wading through the indent corruption), I see you want any columns object to be represented.

Upvotes: 1

user764357
user764357

Reputation:

String concatenation in Python only works between strings. It doesn't infer types based on need like other languages.

There are two options, cast the integer to a strings and add it all together:

>>> x ="a"
>>> y = 1
>>> "(" + x + "," + str(y) + ")"
'(a,1)'
>>> "('" + x + "'," + str(y) + ")"
"('a',1)"
>>> "(" + repr(x) + "," + str(y) + ")"
"('a',1)"

Or use string formatting to take care of some of this behind the scenes. Either using (deprecated) "percent formatting":

>>> "(%s,%d)"%(x,y)
'(a,1)'
>>> "('%s',%d)"%(x,y)
"('a',1)"
>>> "(%s,%d)"%(repr(x),y)
"('a',1)"

Or the more standard and approved format mini-language:

>>> "({0},{1})".format(x, y)
'(a,1)'
>>> "('{0}',{1})".format(x, y)
"('a',1)"
>>> "({0},{1})".format(repr(x), y)
"('a',1)"

Upvotes: 7

Related Questions