Can we make importing filename in python a variable, if we want to import files from different directories?

Question

I have different python modules in different directories: file1.py file2.py file3.py

myapp/
    __init__.py
    dir1/
        __init__.py
        file1.py
    dir2/
        __init__.py
        file2.py
    foo.py
    bar/
         __init__.py
         calling_function.py

module_dict = {key1:file1,key2:file2,key3:file3}

def call_common_func(arguments,module_dict):
    for keyin module_dict .values:
        #I am looking for help for below line.
        from module_dict[value] import common_function 
        common_function(arguments)