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

@netmaster94132,

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 )