使用“”“”“”格式的Python打印格式

Question

I am writing an email application to send mass emails. In the body of the email I want to insert the first name from a list of names. But I can't seem to figure out why this code isn't working. Any suggestions are most appreciated.

first_name = " "

body = """\
Dear {},
Here is new email.
Thanks.
Mike """.format(first_name)

def send_test_email(body):
  first_name = 'mike'
  print(body)

send_test_email(body)

Output:

Dear ,

Here is new email.

Thanks.

Mike

Answer 1

You have already assigned what body is. So even if you change value of parameter ( first_name ) in format later, it does not affect the original body .

first_name = " "

body = """\
Dear {},
Here is new email.
Thanks.
Mike """

def send_test_email(body):
  first_name = 'mike'
  print(body.format(first_name))

send_test_email(body)

# Dear mike,
# Here is new email.                                              
# Thanks.   
# Mike