Examples of how to combine a number into a string in python 3:
Convert the number to a string
A straightforward solution is to convert the number to a string using str():
weight = 95.5s = "my weight is " + str(weight) + "kg"
returns
'my weight is 95.5kg'
Format the number using str.format()
Another better approach is to use str.format():
weight = 95.5s = "my weight is {}kg".format(weight)
also returns
'my weight is 95.5kg'
Format() has many advantages, you can for example insert multiple numbers:
year = 1982month = 7day = 8s = "My date of birth is {}-{}-{}".format(year,month,day)
returns
'My date of birth is 1982-7-8'
Here, lets see some of the most used features:
Round a float number
weight = 95.5s = "my weight is {:.0f}kg".format(weight)
returns
'my weight is 96kg'
Add leading zeros in front of the numbers
year = 1982month = 7day = 8s = "My date of birth is {}-{:02d}-{:02d}".format(year,month,day)
returns
'My date of birth is 1982-07-08'
Format a float number
import mathpi = math.pipis = 'PI value is : {}'.format(pi)
returns
PI value is : 3.141592653589793s = 'PI value is : {:0.2f}'.format(pi)
returns
PI value is : 3.14s = 'PI value is : {:0.4f}'.format(pi)
returns
PI value is : 3.1416s = 'PI value is : {:6.4f}'.format(pi)
returns
PI value is : 3.1416s = 'PI value is : {:10.4f}'.format(pi)
returns
PI value is : 3.1416
Summary table
| Input | Format | Output |
|---|---|---|
| 95.5 | :.0f | 96 |
| 8 | :02d | 08 |
| 8 | :04d | 0008 |
| 3.141592653589793 | 3.141592653589793 | |
| 3.141592653589793 | :0.2f | 3.14 |
| 3.141592653589793 | :0.4f | 3.1416 |
| 3.141592653589793 | :6.4f | 3.1416 |
| 3.141592653589793 | :10.4f | 3.1416 |
