Format message by calling a written python function name in string

February 25, 2022

I have functions

def getName():
   name = "Mark"
   return name

def getDay():
   day = "Tuesday"
   return day

I have a variable

message = "Hi there [getName] today is [getDay]"

I need to check all occurences for the strings between the square brackets in my message variable and check whether that name is a function that exists so that I can evaluate the value returned by the function and finally come up with a new message string as follows

message = "Hi there Mark, today is Tuesday

>Solution :

There is another way of achieving this if you specifically want to use the string in that format. However, fstrings as shown in the above answer are a much superior alternative.

def f(message):
    returned_value=''
    m_copy=message
    while True:
        if '[' in m_copy:
            returned_value+=m_copy[:m_copy.index('[')]
            returned_value+=globals()[m_copy[m_copy.index('[')+1:m_copy.index(']')]]()
            m_copy=m_copy[m_copy.index(']')+1:]
        else:
            return returned_value+m_copy