# Pull It Together: File "python", line 25, in <module> NameError: name 'charlotte' is not defined

#1

heres the code. what am i doing wrong?

``````def hotel_cost(nights):
return days * 140
def plane_ride_cost(city):
city = city.lowercase
if city == "charlotte":
return 183
elif city == "tampa":
return 220
elif city == "pittsburgh":
return 222
elif city == "los Angeles":
return 475
else:
print "You have entered the wrong City"
def rental_car_cost(days):
new_days = days * 40
if days >= 7:
new_days -= 50
elif 7 > days >= 3:
new_days -= 20
return new_days
def trip_cost(city, days):
return hotel_cost(nights) + rental_car_cost(days) +        plane_ride_cost(city)

print trip_cost(charlotte, 10)``````

#2
``````def trip_cost(city, days):
return hotel_cost(days) + rental_car_cost(days) + plane_ride_cost(city)

print trip_cost("Charlotte", 10)``````

#3
``````def tip_cost(city, days):
return hotel_cost(days) + rental_car_cost(days) + plane_ride_cost(city)

print trip_cost("Charlotte", 10)``````

rest is same. error i now get is

"Traceback (most recent call last):
File "python", line 25, in "<'module' >
File "python", line 23, in trip_cost
NameError: global name 'nights' is not defined"

#4

### the FUNCTION talk

``````def myFunc( param1, param2):
# Begin of =myFunc= FUNCTION-BODY
# this =myFunc= function- has 2 PARAMETERS param1 and param2
# param1 and param2 PARAMETERS are used
# as -local- VARIABLES throughout the =myFunc= FUNCTION-BODY
print param1 + " and " + param2
#End of =myFunc= FUNCTION-BODY``````

If you want to call/execute the myFunc function
you will have to add a pair of parentheses to myFunc
like
myFunc()
As the myFunc function was defined
as having 2 parameters
you have to provide 2 arguments
in our case 2 string VALUES "Alena" and "Lauren"
like
myFunc("Alena","Lauren")

some quotes from the outer-world:

**argument is the value/variable/reference being passed in,
parameter is the receiving variable used within the function/block**

OR

**"parameters" are called "formal parameters",
while "arguments" are called "actual parameters".**

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++ function with 1 parameter using return-statement

``````def myFunction( param1 ):
# //Begin of =myFunction= FUNCTION-BODY
# //=myFunction= function has 1 PARAMETER param1
# //this param1 PARAMETER is used as a -local- VARIABLE
# //throughout the =myFunction= FUNCTION-BODY
return param1;
# //End of FUNCTION-BODY``````

You have defined a myFunction function
which takes 1 parameter param1
this param1 parameter is used
as a variable throughout the =myFunction= FUNCTION-BODY.

If you want to call/execute this myFunction function
and this myFunction function was defined
as having 1 parameter param1
you will have to provide 1 argument
in our case a "number VALUE" 4
myFunction( 4 )

some quotes from the outer-world:

**argument is the value/variable/reference being passed in,
parameter is the receiving variable used within the function/block**

OR

**"parameters" are called "formal parameters",
while "arguments" are called "actual parameters".**

#### ============================================

As you are using the return-statement in your myFunction function
you will only get a return-value no-display.
You can however capture this return-value in a variable
and then use the print-method to do a display.

``````theResult = myFunction( 4 )
print theResult``````

OR directly

``print myFunction( 4 )``