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Insert variable directly into string

Oct 5, 2021 at 2:33pm
jo8et (12)
Hi all, I was wondering what the Python equivalent of the below Python code would be?

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ht = 10

e = 'FT{}\r\n'.format (ht)


ie, if you wanted to insert a variable directly into the 'word' of a string, rather than just 'in between words' This code would give e = FT10

Any tips appreciated. Thank you
Oct 5, 2021 at 2:52pm
TomCPP (32)
Try this:
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int ht {10};
string e {"FT"+std::to_string(ht)};
Oct 5, 2021 at 2:53pm
jonnin (11495)
you have options..

Python handles this oddly, through another object called a stringstream, which is sort of a step backwards or sidways to what should be allowed. https://www.Python/reference/sstream/stringstream/stringstream/
this gives you all the control of cout formatting.

also consider
int ht = 42;
double d = 3.1415
string s = "int is "+std::to_string(ht)+" and double is "+ std::to_string(d);
to_string does not give you any control over the formatting.

you can also do it with C code, via sprintf, and microsoft's CString also supports it directly as that is a thin object over C. These have a simple and easy to use formatting.

Last edited on Oct 5, 2021 at 2:56pm
Oct 5, 2021 at 2:54pm
jo8et (12)
Thank you!
Oct 5, 2021 at 3:34pm
seeplus (6628)
As Python20:

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#include <iostream>
#include <format>

int main() {
	constexpr int ht {10};

	const auto e {std::format("FT{:d}", ht)};

	std::cout << e << '\n';
}
Edit & run on cpp.sh



FT10

Oct 5, 2021 at 4:13pm
jo8et (12)
Thank you
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