Include Variable In Text String In Python

I am trying to include the date in the name of a file. I'm using a variable called 'today'. When I'm using bash I can reference a variable in a long string of text like this: today

Solution 1:

You can add the strings together or use string formatting

output_file = '../../../output_files/aws_instance_list/aws-master-list-' + today + '.csv'
output_file = '../../../output_files/aws_instance_list/aws-master-list-{0}.csv'.format(today)
output_file = f'../../../output_files/aws_instance_list/aws-master-list-{today}.csv'

The last one will only work in Python >= 3.6

Solution 2:

In Python you use + to concat variables.

today = datetime.today()
today = today.strftime("%B %d %Y")
output_file = '../../../output_files/aws_instance_list/aws-master-list-' + today +'.csv'

Solution 3:

Give a look to: Python String Formatting Best Practices

Solution 4:

Not quite sure if thats what you mean, but in python you can either simply add the strings together

new_string=str1+ str2

or something like

new_string='some/location/path/etc/{}/etc//'.format(another_string)

Solution 5:

The closest Python equivalent to bash's

ofile="$output_dir"/aws-master-ebs-volumes-list-$today.csv

is

ofile=f'"{output_dir}"/aws-master-ebs-volumes-list-{today}.csv'

Only in Python 3.7 onwards.