ISOCHRONE_DURATIONS_MINUTES = (15, 30, 45)

CAR_MODE = 'car'
PUBLIC_MODE = 'public'

DEFAULT_TRAVEL_MODE = CAR_MODE

TRAVEL_MODES = (
    PUBLIC_MODE,
    CAR_MODE,
)

TRAVEL_MODES_FRENCH = {
    CAR_MODE: 'Voiture',
    PUBLIC_MODE: 'Transports en commun',
}

ENABLE_CAR_MODE = True
ENABLE_PUBLIC_MODE = True

ISOCHRONE_DURATIONS_MINUTES = (15, 30, 45)

CAR_MODE = 'car'
PUBLIC_MODE = 'public'

TRAVEL_MODES = ()
if ENABLE_PUBLIC_MODE:
    TRAVEL_MODES += (PUBLIC_MODE,)
if ENABLE_CAR_MODE:
    TRAVEL_MODES += (CAR_MODE,)

if ENABLE_CAR_MODE:
    DEFAULT_TRAVEL_MODE = CAR_MODE
else:
    DEFAULT_TRAVEL_MODE = PUBLIC_MODE

TRAVEL_MODES_FRENCH = {
    CAR_MODE: 'Voiture',
    PUBLIC_MODE: 'Transports en commun',
}

Add option to enable/disable each travel_mode
Add option to enable/disable each travel_mode

+ ENABLE_CAR_MODE = True
+ ENABLE_PUBLIC_MODE = True
+ 
  ISOCHRONE_DURATIONS_MINUTES = (15, 30, 45)
  
  CAR_MODE = 'car'
  PUBLIC_MODE = 'public'
  
- DEFAULT_TRAVEL_MODE = CAR_MODE
+ TRAVEL_MODES = ()
+ if ENABLE_PUBLIC_MODE:
+     TRAVEL_MODES += (PUBLIC_MODE,)
+ if ENABLE_CAR_MODE:
+     TRAVEL_MODES += (CAR_MODE,)
  
- TRAVEL_MODES = (
-     PUBLIC_MODE,
-     CAR_MODE,
- )
+ if ENABLE_CAR_MODE:
+     DEFAULT_TRAVEL_MODE = CAR_MODE
+ else:
+     DEFAULT_TRAVEL_MODE = PUBLIC_MODE
  
  TRAVEL_MODES_FRENCH = {
      CAR_MODE: 'Voiture',
      PUBLIC_MODE: 'Transports en commun',
  }
  
Add option to enable/disable each travel_mode
## Code Before:
ISOCHRONE_DURATIONS_MINUTES = (15, 30, 45)

CAR_MODE = 'car'
PUBLIC_MODE = 'public'

DEFAULT_TRAVEL_MODE = CAR_MODE

TRAVEL_MODES = (
    PUBLIC_MODE,
    CAR_MODE,
)

TRAVEL_MODES_FRENCH = {
    CAR_MODE: 'Voiture',
    PUBLIC_MODE: 'Transports en commun',
}

## Instruction:
Add option to enable/disable each travel_mode
## Code After:
ENABLE_CAR_MODE = True
ENABLE_PUBLIC_MODE = True

ISOCHRONE_DURATIONS_MINUTES = (15, 30, 45)

CAR_MODE = 'car'
PUBLIC_MODE = 'public'

TRAVEL_MODES = ()
if ENABLE_PUBLIC_MODE:
    TRAVEL_MODES += (PUBLIC_MODE,)
if ENABLE_CAR_MODE:
    TRAVEL_MODES += (CAR_MODE,)

if ENABLE_CAR_MODE:
    DEFAULT_TRAVEL_MODE = CAR_MODE
else:
    DEFAULT_TRAVEL_MODE = PUBLIC_MODE

TRAVEL_MODES_FRENCH = {
    CAR_MODE: 'Voiture',
    PUBLIC_MODE: 'Transports en commun',
}
