In this tutorial, we will learn how to concatenate strings, variables, and numbers in Python using the print function. Concatenation is a common task in programming where you join multiple strings together to create a combined string.
Python offers several ways to achieve this, but we will focus on using the print function.
Step 1: Using the Plus Operator (+) for String Concatenation
One of the simplest ways to concatenate strings in Python is using the plus operator (+). Let’s take a look at an example:
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string1 = "Hello, " string2 = "world!" combined_string = string1 + string2 print(combined_string) |
In this example, we join two strings string1 and string2 using the plus operator, and then we print the result using the print function. The output of this code will be:
Hello, world!
However, this approach does not work when you want to concatenate variables of different data types (e.g., integers and strings). In that case, you will need to convert the non-string data types to strings using the str() function, as shown in the following example:
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string1 = "Hello, " string2 = "world! Today is day " day_number = 5 combined_string = string1 + string2 + str(day_number) print(combined_string) |
The output of this code will be:
Hello, world! Today is day 5
Step 2: Using Format Strings (f-strings)
Introduced in Python 3.6, format strings (also known as f-strings) are an effective and concise way to concatenate strings, variables, and numbers. To create an f-string, prefix the string with an f or F character and place expressions within curly braces {}. Here’s an example:
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name = "John" age = 30 print(f"My name is {name} and I am {age} years old.") |
The output of this code will be:
My name is John and I am 30 years old.
You can also include calculations and format specifiers within the curly braces. For example:
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price = 49.99 print(f"The price is ${price:.2f}") |
The output of this code will be:
The price is $49.99
Step 3: Using the str.format() Method
Another way of concatenating strings is using the str.format() method. This method replaces placeholders, specified by a pair of curly braces {}, with values provided as arguments to the format() function.
Here’s an example of using str.format():
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name = "Jane" age = 25 print("My name is {} and I am {} years old.".format(name, age)) |
The output of this code will be:
My name is Jane and I am 25 years old.
You can also use positional and keyword arguments to customize the order of replacement:
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print("My name is {1} and I am {0} years old.".format(age, name)) |
The output of this code will be:
My name is Jane and I am 25 years old.
Full Code
Here’s the full code from all the examples above:
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string1 = "Hello, " string2 = "world!" combined_string = string1 + string2 print(combined_string) string1 = "Hello, " string2 = "world! Today is day " day_number = 5 combined_string = string1 + string2 + str(day_number) print(combined_string) name = "John" age = 30 print(f"My name is {name} and I am {age} years old.") price = 49.99 print(f"The price is ${price:.2f}") name = "Jane" age = 25 print("My name is {} and I am {} years old.".format(name, age)) print("My name is {1} and I am {0} years old.".format(age, name)) |
Conclusion
In this tutorial, we explored three different ways to concatenate strings, variables, and numbers in Python using the print function: the plus operator (+), format strings (f-strings), and the str.format() method.
Depending on your specific use case and personal preference, any of these methods can be used to effectively concatenate data in Python.