How do you concatenate a variable and a string in python?

❮ Python Glossary

String Concatenation

String concatenation means add strings together.

Use the + character to add a variable to another variable:

Example

x = "Python is "
y = "awesome"
z =  x + y
print(z)

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Example

Merge variable a with variable b into variable c:

a = "Hello"
b = "World"
c = a + b
print(c)

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Example

To add a space between them, add a " ":

a = "Hello"
b = "World"
c = a + " " + b
print(c)

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For numbers, the + character works as a mathematical operator:

Example

x = 5
y = 10
print(x + y)

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If you try to combine a string and a number, Python will give you an error:

Example

x = 5
y = "John"
print(x + y)

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Related Pages

Python Variables Tutorial Creating Variables Variable Names Assign Value to Multiple Variables Output Variables Global Variables

❮ Python Glossary

I want to include a file name, 'main.txt', in the subject. For that I am passing a file name from the command line. But I get an error in doing so:

python sample.py main.txt # Running 'python' with an argument

msg['Subject'] = "Auto Hella Restart Report "sys.argv[1]  # Line where I am using that passed argument

How can I fix this problem?

asked Aug 21, 2013 at 4:09

Shivam AgrawalShivam Agrawal

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3

I'm guessing that you meant to do this:

msg['Subject'] = "Auto Hella Restart Report " + sys.argv[1]
# To concatenate strings in Python, use       ^

answered Aug 21, 2013 at 4:10

Using f-strings which were introduced in Python version 3.6:

msg['Subject'] = f'Auto Hella Restart Report {sys.argv[1]}'

answered Dec 11, 2019 at 16:46

5

variable=" Hello..."
print (variable)
print("This is the Test File " + variable)

For an integer type:

variable = "  10"
print (variable)
print("This is the Test File " + str(variable))

answered Jun 24, 2016 at 3:17

Smith JohnSmith John

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1

Try:

msg['Subject'] = "Auto Hella Restart Report " + sys.argv[1]

The + operator is overridden in Python to concatenate strings.

answered Aug 21, 2013 at 4:13

DotPiDotPi

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If you need to add two strings, you have to use the '+' operator.

Hence

msg['Subject'] = 'your string' + sys.argv[1]

And also you have to import sys in the beginning.

As

import sys

msg['Subject'] = "Auto Hella Restart Report " + sys.argv[1]

answered Aug 21, 2013 at 4:16

AntoAnto

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1

With Python 3.6 and later:

msg['Subject'] = f"Auto Hella Restart Report {sys.argv[1]}"

answered Jul 24, 2019 at 2:34

DoryxDoryx

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2

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