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How can i add my objects into a list to choose them randomly to blit onto the screen?

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1

When i try to put my objects into a list, i can not get an output with object names, it gives a weird output like "_ main _.object at 0x029E7210". I want to select my objects randomly to blit ONE of them onto the screen. But i could not figure this out.

car_main = pygame.image.load("car_main.png")
car_red_ = pygame.image.load("car_red.png")
car_blue = pygame.image.load("car_blue.png")

class cars:

 def __init__(self,x,y,car_type,w=50,h=100,s=5):
 self.x = x
 self.y = y
 self.w = w
 self.h = h
 self.s = s
 self.car_type = car_type

 def draw(self):
 dp.blit(self.car_type,(self.x,self.y))

car1 = cars(x,y,car_main)
car2 = cars(x,y,car_red)
car3 = cars(x,y,car_blue)
car_list = [car1,car2,car3]
rc = random.choice(car_list)
print(rc)

# output> __main__.object at 0x02A97230

When I change

car_list = [car1,car2,car3] with;
car_list = [car1.car_type,car2.car_type,car3.car_type]

# output > Surface(50x100x32 SW)

But I want to see an output as my object names. Not as a string type ("car_main"). I want to get an output as the object name (car_main) directly. Because in the main loop, i will choose one of them to blit onto the screen everytime when the loop renews itself.

python

share|improve this question

edited Mar 26 at 9:49

knh190

1,78311 gold badge88 silver badges2424 bronze badges

asked Mar 26 at 9:01

Arda AltunArda Altun

3811 silver badge77 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It's printing an object's address in memory if you didn't define __str__ method for it.
  
  – knh190
  Mar 26 at 9:03
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  what kind of a code do i need?
  
  – Arda Altun
  Mar 26 at 9:05
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You need a __str__ for desired class stackoverflow.com/questions/8144026/…
  
  – knh190
  Mar 26 at 9:07
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Also you need to find the variable name in globals() or locals() - depends on your scope.
  
  – knh190
  Mar 26 at 9:10
  

  
  
  
  

add a comment | 

1

When i try to put my objects into a list, i can not get an output with object names, it gives a weird output like "_ main _.object at 0x029E7210". I want to select my objects randomly to blit ONE of them onto the screen. But i could not figure this out.

car_main = pygame.image.load("car_main.png")
car_red_ = pygame.image.load("car_red.png")
car_blue = pygame.image.load("car_blue.png")

class cars:

 def __init__(self,x,y,car_type,w=50,h=100,s=5):
 self.x = x
 self.y = y
 self.w = w
 self.h = h
 self.s = s
 self.car_type = car_type

 def draw(self):
 dp.blit(self.car_type,(self.x,self.y))

car1 = cars(x,y,car_main)
car2 = cars(x,y,car_red)
car3 = cars(x,y,car_blue)
car_list = [car1,car2,car3]
rc = random.choice(car_list)
print(rc)

# output> __main__.object at 0x02A97230

When I change

car_list = [car1,car2,car3] with;
car_list = [car1.car_type,car2.car_type,car3.car_type]

# output > Surface(50x100x32 SW)

But I want to see an output as my object names. Not as a string type ("car_main"). I want to get an output as the object name (car_main) directly. Because in the main loop, i will choose one of them to blit onto the screen everytime when the loop renews itself.

python

share|improve this question

edited Mar 26 at 9:49

knh190

1,78311 gold badge88 silver badges2424 bronze badges

asked Mar 26 at 9:01

Arda AltunArda Altun

3811 silver badge77 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It's printing an object's address in memory if you didn't define __str__ method for it.
  
  – knh190
  Mar 26 at 9:03
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  what kind of a code do i need?
  
  – Arda Altun
  Mar 26 at 9:05
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You need a __str__ for desired class stackoverflow.com/questions/8144026/…
  
  – knh190
  Mar 26 at 9:07
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Also you need to find the variable name in globals() or locals() - depends on your scope.
  
  – knh190
  Mar 26 at 9:10
  

  
  
  
  

add a comment | 

When i try to put my objects into a list, i can not get an output with object names, it gives a weird output like "_ main _.object at 0x029E7210". I want to select my objects randomly to blit ONE of them onto the screen. But i could not figure this out.

car_main = pygame.image.load("car_main.png")
car_red_ = pygame.image.load("car_red.png")
car_blue = pygame.image.load("car_blue.png")

class cars:

 def __init__(self,x,y,car_type,w=50,h=100,s=5):
 self.x = x
 self.y = y
 self.w = w
 self.h = h
 self.s = s
 self.car_type = car_type

 def draw(self):
 dp.blit(self.car_type,(self.x,self.y))

car1 = cars(x,y,car_main)
car2 = cars(x,y,car_red)
car3 = cars(x,y,car_blue)
car_list = [car1,car2,car3]
rc = random.choice(car_list)
print(rc)

# output> __main__.object at 0x02A97230

When I change

car_list = [car1,car2,car3] with;
car_list = [car1.car_type,car2.car_type,car3.car_type]

# output > Surface(50x100x32 SW)

But I want to see an output as my object names. Not as a string type ("car_main"). I want to get an output as the object name (car_main) directly. Because in the main loop, i will choose one of them to blit onto the screen everytime when the loop renews itself.

python

share|improve this question

edited Mar 26 at 9:49

knh190

1,78311 gold badge88 silver badges2424 bronze badges

asked Mar 26 at 9:01

Arda AltunArda Altun

3811 silver badge77 bronze badges

car_main = pygame.image.load("car_main.png")
car_red_ = pygame.image.load("car_red.png")
car_blue = pygame.image.load("car_blue.png")

class cars:

 def __init__(self,x,y,car_type,w=50,h=100,s=5):
 self.x = x
 self.y = y
 self.w = w
 self.h = h
 self.s = s
 self.car_type = car_type

 def draw(self):
 dp.blit(self.car_type,(self.x,self.y))

car1 = cars(x,y,car_main)
car2 = cars(x,y,car_red)
car3 = cars(x,y,car_blue)
car_list = [car1,car2,car3]
rc = random.choice(car_list)
print(rc)

# output> __main__.object at 0x02A97230

car_list = [car1,car2,car3] with;
car_list = [car1.car_type,car2.car_type,car3.car_type]

# output > Surface(50x100x32 SW)

share|improve this question

edited Mar 26 at 9:49

knh190

1,78311 gold badge88 silver badges2424 bronze badges

asked Mar 26 at 9:01

Arda AltunArda Altun

3811 silver badge77 bronze badges

share|improve this question

edited Mar 26 at 9:49

knh190

1,78311 gold badge88 silver badges2424 bronze badges

asked Mar 26 at 9:01

Arda AltunArda Altun

3811 silver badge77 bronze badges

edited Mar 26 at 9:49

knh190

1,78311 gold badge88 silver badges2424 bronze badges

edited Mar 26 at 9:49

knh190

1,78311 gold badge88 silver badges2424 bronze badges

asked Mar 26 at 9:01

Arda AltunArda Altun

3811 silver badge77 bronze badges

asked Mar 26 at 9:01

Arda AltunArda Altun

3811 silver badge77 bronze badges

2 Answers
2

active

oldest

votes

2

You need to define __str__ for your class Car to let it properly handle object to string:

class Car:

 def __str__(self):
 for k, var in globals().items():
 if var == self:
 return k
 # default
 return "Car"

---

Note1: Usually use uppercased Car for a class and car for an instance.

---

Note2: Look up variable strings in globals is not reliable. You may not want to make all variables global, and manually search them in scope is tedious. Actually why don't you give your Car a name attribute? Then you nicely have:

class Car:

 def __init__(self, name):
 self.name=name

 def __str__(self):
 return self.name

car = Car(name='first car')
print(car) # 'first car'

---

More read about "magic methods": https://rszalski.github.io/magicmethods/#representations

share|improve this answer

edited Mar 26 at 14:25

answered Mar 26 at 9:16

knh190knh190

1,78311 gold badge88 silver badges2424 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i just added "name" into the init method. and i called my object (car1 = cars("car_red",x,y,car_type) and it gives the name. should i add str ? because it seems like it works currently
  
  – Arda Altun
  Mar 26 at 10:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ArdaAltun Well, not 100% sure with your current code, but you should solve the perplex after reading the referenced link. It explains why/when you should define __str__()
  
  – knh190
  Mar 26 at 14:24
  

  
  
  
  

add a comment | 

0

Add a __str()__ magic method to your car class like so:

def __str__(self):
 return f'car with x of self.x, y of self.y, and type of self.car_type'

share|improve this answer

edited Mar 26 at 9:15

answered Mar 26 at 9:12

Alec AlameddineAlec Alameddine

3,90344 gold badges1313 silver badges4040 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It should not be a print!
  
  – knh190
  Mar 26 at 9:14
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Silly mistake! My bad. Edited to return
  
  – Alec Alameddine
  Mar 26 at 9:15
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  And OP actually wanted to print the variable string instead of inspecting :) while that's not a good idea.
  
  – knh190
  Mar 26 at 9:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  how can i call this function? what should i type? when i type print(car.__str__) it gives a weird output
  
  – Arda Altun
  Mar 26 at 10:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  you can do that but once you've defined a str function you can just print car. If you don't like the output change the return
  
  – Alec Alameddine
  Mar 26 at 10:40
  
  

  
  
  
  

add a comment | 

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2

You need to define __str__ for your class Car to let it properly handle object to string:

class Car:

 def __str__(self):
 for k, var in globals().items():
 if var == self:
 return k
 # default
 return "Car"

---

Note1: Usually use uppercased Car for a class and car for an instance.

---

Note2: Look up variable strings in globals is not reliable. You may not want to make all variables global, and manually search them in scope is tedious. Actually why don't you give your Car a name attribute? Then you nicely have:

class Car:

 def __init__(self, name):
 self.name=name

 def __str__(self):
 return self.name

car = Car(name='first car')
print(car) # 'first car'

---

More read about "magic methods": https://rszalski.github.io/magicmethods/#representations

share|improve this answer

edited Mar 26 at 14:25

answered Mar 26 at 9:16

knh190knh190

1,78311 gold badge88 silver badges2424 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i just added "name" into the init method. and i called my object (car1 = cars("car_red",x,y,car_type) and it gives the name. should i add str ? because it seems like it works currently
  
  – Arda Altun
  Mar 26 at 10:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ArdaAltun Well, not 100% sure with your current code, but you should solve the perplex after reading the referenced link. It explains why/when you should define __str__()
  
  – knh190
  Mar 26 at 14:24
  

  
  
  
  

add a comment | 

2

You need to define __str__ for your class Car to let it properly handle object to string:

class Car:

 def __str__(self):
 for k, var in globals().items():
 if var == self:
 return k
 # default
 return "Car"

---

Note1: Usually use uppercased Car for a class and car for an instance.

---

Note2: Look up variable strings in globals is not reliable. You may not want to make all variables global, and manually search them in scope is tedious. Actually why don't you give your Car a name attribute? Then you nicely have:

class Car:

 def __init__(self, name):
 self.name=name

 def __str__(self):
 return self.name

car = Car(name='first car')
print(car) # 'first car'

---

More read about "magic methods": https://rszalski.github.io/magicmethods/#representations

share|improve this answer

edited Mar 26 at 14:25

answered Mar 26 at 9:16

knh190knh190

1,78311 gold badge88 silver badges2424 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  i just added "name" into the init method. and i called my object (car1 = cars("car_red",x,y,car_type) and it gives the name. should i add str ? because it seems like it works currently
  
  – Arda Altun
  Mar 26 at 10:42
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ArdaAltun Well, not 100% sure with your current code, but you should solve the perplex after reading the referenced link. It explains why/when you should define __str__()
  
  – knh190
  Mar 26 at 14:24
  

  
  
  
  

add a comment | 

You need to define __str__ for your class Car to let it properly handle object to string:

class Car:

 def __str__(self):
 for k, var in globals().items():
 if var == self:
 return k
 # default
 return "Car"

---

Note1: Usually use uppercased Car for a class and car for an instance.

---

Note2: Look up variable strings in globals is not reliable. You may not want to make all variables global, and manually search them in scope is tedious. Actually why don't you give your Car a name attribute? Then you nicely have:

class Car:

 def __init__(self, name):
 self.name=name

 def __str__(self):
 return self.name

car = Car(name='first car')
print(car) # 'first car'

---

More read about "magic methods": https://rszalski.github.io/magicmethods/#representations

share|improve this answer

edited Mar 26 at 14:25

answered Mar 26 at 9:16

knh190knh190

1,78311 gold badge88 silver badges2424 bronze badges

class Car:

 def __str__(self):
 for k, var in globals().items():
 if var == self:
 return k
 # default
 return "Car"

class Car:

 def __init__(self, name):
 self.name=name

 def __str__(self):
 return self.name

car = Car(name='first car')
print(car) # 'first car'

share|improve this answer

edited Mar 26 at 14:25

answered Mar 26 at 9:16

knh190knh190

1,78311 gold badge88 silver badges2424 bronze badges

answered Mar 26 at 9:16

knh190knh190

1,78311 gold badge88 silver badges2424 bronze badges

answered Mar 26 at 9:16

knh190knh190

1,78311 gold badge88 silver badges2424 bronze badges

0

Add a __str()__ magic method to your car class like so:

def __str__(self):
 return f'car with x of self.x, y of self.y, and type of self.car_type'

share|improve this answer

edited Mar 26 at 9:15

answered Mar 26 at 9:12

Alec AlameddineAlec Alameddine

3,90344 gold badges1313 silver badges4040 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It should not be a print!
  
  – knh190
  Mar 26 at 9:14
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Silly mistake! My bad. Edited to return
  
  – Alec Alameddine
  Mar 26 at 9:15
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  And OP actually wanted to print the variable string instead of inspecting :) while that's not a good idea.
  
  – knh190
  Mar 26 at 9:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  how can i call this function? what should i type? when i type print(car.__str__) it gives a weird output
  
  – Arda Altun
  Mar 26 at 10:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  you can do that but once you've defined a str function you can just print car. If you don't like the output change the return
  
  – Alec Alameddine
  Mar 26 at 10:40
  
  

  
  
  
  

add a comment | 

0

Add a __str()__ magic method to your car class like so:

def __str__(self):
 return f'car with x of self.x, y of self.y, and type of self.car_type'

share|improve this answer

edited Mar 26 at 9:15

answered Mar 26 at 9:12

Alec AlameddineAlec Alameddine

3,90344 gold badges1313 silver badges4040 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It should not be a print!
  
  – knh190
  Mar 26 at 9:14
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Silly mistake! My bad. Edited to return
  
  – Alec Alameddine
  Mar 26 at 9:15
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  And OP actually wanted to print the variable string instead of inspecting :) while that's not a good idea.
  
  – knh190
  Mar 26 at 9:24
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  how can i call this function? what should i type? when i type print(car.__str__) it gives a weird output
  
  – Arda Altun
  Mar 26 at 10:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  you can do that but once you've defined a str function you can just print car. If you don't like the output change the return
  
  – Alec Alameddine
  Mar 26 at 10:40
  
  

  
  
  
  

add a comment | 

Add a __str()__ magic method to your car class like so:

def __str__(self):
 return f'car with x of self.x, y of self.y, and type of self.car_type'

share|improve this answer

edited Mar 26 at 9:15

answered Mar 26 at 9:12

Alec AlameddineAlec Alameddine

3,90344 gold badges1313 silver badges4040 bronze badges

def __str__(self):
 return f'car with x of self.x, y of self.y, and type of self.car_type'

share|improve this answer

edited Mar 26 at 9:15

answered Mar 26 at 9:12

Alec AlameddineAlec Alameddine

3,90344 gold badges1313 silver badges4040 bronze badges

answered Mar 26 at 9:12

Alec AlameddineAlec Alameddine

3,90344 gold badges1313 silver badges4040 bronze badges

answered Mar 26 at 9:12

Alec AlameddineAlec Alameddine

3,90344 gold badges1313 silver badges4040 bronze badges