SyntaxError: invalid syntax

[snippsat]

There are several error and logic that don't work(like add,remove).
Here fixing so most run,the logic you have to look at again.
Do small step,and test your code at each step,than some of this mess could be avoided

class Employee:
    raise_amt = 1.04
    def __init__(self, first, last, pay):
        self.first = first
        self.last = last
        self.email = '{}.{}@email.com'.format(first, last)
        self.pay = pay

    @property
    def fullname(self):
        return '{} {}'.format(self.first, self.last)

    @property
    def apply_raise(self):
        self.pay = int(self.pay * self.raise_amt)

class Developer(Employee):
    raise_amt = 1.1
    def __init__(self, first, last, pay, prog_lang):
        super().__init__(first, last, pay)
        self.prog_lang = prog_lang

class Manager(Employee):
    def __init__(self, first, last, pay, employees=None):
        super().__init__(first, last, pay)
        if employees is None:
            self.employees = []
        else:
            self.employees = employees

    def add_emp(self, emp):
        '''
        if emp not in self.employees:
            self.employees.append(emp)'''

    def remove_emp(self, foo):
        for emp in self.employees:
            if emp.last == foo:
                # Fix so it print something
                print(emp.last)

    def print_emps(self):
        for emp in self.employees:
            print('--> {} {}'.format(emp.first, emp.last))

dev_1 = Developer('Corey', 'Schafer', 50000, 'Python')
dev_2 = Developer('Test', 'Employee', 60000, 'Java')

mgr_1 = Manager('Sue', 'Smith', 90000, [dev_1])

Test:

>>> dev_1.fullname
'Corey Schafer'
>>> dev_1.prog_lang
'Python'
>>> dev_1.pay
50000
>>> dev_1.apply_raise
>>> dev_1.pay
55000
>>> mgr_1.print_emps()
--> Corey Schafer
>>> mgr_1.remove_emp('Schafer')
Schafer