import os
os.system
def clear():
if os.name == 'nt':
os.system('cls')
elif os.name == 'posix':
os.system('clear')
def menu():
print(': THREE DAY PLANNER :')
print('---------------------')
print(' WORKOUT GOALS! ')
print(' ONE DAY AT A TIME. ')
print('---------------------')
def table():
print('TODAY: Run 5 km')
print('TOMORROW: Lift 10 kg')
print('LATER: Cycle 30 km')
print('---------------------')
def operations():
print('n | Next day')
print('c | Change goal')
print('e | Exit program')
print('---------------------')
def next_day():
print('TODAY: Lift 10 kg')
print('TOMORROW: Cycle 30 km')
print('LATER: ')
print('---------------------')
while True:
menu()
table()
operations()
operation = input('operation > ')
if operation =='e':
exit()
elif operation == 'n':