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What is wrong with using a bare 'except'? [duplicate]

About catching ANY exceptionWhat does ** (double star/asterisk) and * (star/asterisk) do for parameters?How do I check whether a file exists without exceptions?What are metaclasses in Python?What is the difference between @staticmethod and @classmethod?What does the “yield” keyword do?What does if __name__ == “__main__”: do?What is __init__.py for?Manually raising (throwing) an exception in PythonCatch multiple exceptions in one line (except block)Creating a singleton in Python

8

This question already has an answer here:

• 
  About catching ANY exception
  
  8 answers
  
  

I tried making a function to check if an image is displayed on the screen using PyAutoGui and came up with this:

def check_image_on_screen(image):

    try:

        pyautogui.locateCenterOnScreen(image)

        return True

    except:

        return False

And it works fine, but PyCharm tells me I shouldn't leave except bare. What is the problem with leaving it like this? Is there a more appropriate way of creating the same function?

python pyautogui except bare

share|improve this question

edited 10 hours ago

Peter Mortensen

13.7k1986112

asked 15 hours ago

CaioRamaglioCaioRamaglio

411

New contributor

CaioRamaglio is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

marked as duplicate by jamesdlin, Christian Dean python
Users with the  python badge can single-handedly close python questions as duplicates and reopen them as needed.

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10 hours ago

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  See also stackoverflow.com/q/4990718/20670
  
  – Tim Pietzcker
  15 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Wikipedia has some good information on this--it's called error hiding.
  
  – John Szakmeister
  15 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm not sure this is a duplicate of that. This is asking "Why not bare except" while that one is asking "How do I bare except." A good answer for the latter probably answers the former, but that doth not a duplicate make.
  
  – Adam Smith
  15 hours ago
  

  
  
  
  

add a comment | 

8

This question already has an answer here:

• 
  About catching ANY exception
  
  8 answers
  
  

I tried making a function to check if an image is displayed on the screen using PyAutoGui and came up with this:

def check_image_on_screen(image):

    try:

        pyautogui.locateCenterOnScreen(image)

        return True

    except:

        return False

And it works fine, but PyCharm tells me I shouldn't leave except bare. What is the problem with leaving it like this? Is there a more appropriate way of creating the same function?

python pyautogui except bare

share|improve this question

edited 10 hours ago

Peter Mortensen

13.7k1986112

asked 15 hours ago

CaioRamaglioCaioRamaglio

411

New contributor

CaioRamaglio is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

marked as duplicate by jamesdlin, Christian Dean python
Users with the  python badge can single-handedly close python questions as duplicates and reopen them as needed.

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10 hours ago

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  See also stackoverflow.com/q/4990718/20670
  
  – Tim Pietzcker
  15 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Wikipedia has some good information on this--it's called error hiding.
  
  – John Szakmeister
  15 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I'm not sure this is a duplicate of that. This is asking "Why not bare except" while that one is asking "How do I bare except." A good answer for the latter probably answers the former, but that doth not a duplicate make.
  
  – Adam Smith
  15 hours ago
  

  
  
  
  

add a comment | 

This question already has an answer here:

• 
  About catching ANY exception
  
  8 answers
  
  

I tried making a function to check if an image is displayed on the screen using PyAutoGui and came up with this:

def check_image_on_screen(image):

    try:

        pyautogui.locateCenterOnScreen(image)

        return True

    except:

        return False

And it works fine, but PyCharm tells me I shouldn't leave except bare. What is the problem with leaving it like this? Is there a more appropriate way of creating the same function?

python pyautogui except bare

share|improve this question

edited 10 hours ago

Peter Mortensen

13.7k1986112

asked 15 hours ago

CaioRamaglioCaioRamaglio

411

New contributor

CaioRamaglio is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

def check_image_on_screen(image):

    try:

        pyautogui.locateCenterOnScreen(image)

        return True

    except:

        return False

share|improve this question

edited 10 hours ago

Peter Mortensen

13.7k1986112

asked 15 hours ago

CaioRamaglioCaioRamaglio

411

New contributor

CaioRamaglio is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 10 hours ago

Peter Mortensen

13.7k1986112

asked 15 hours ago

CaioRamaglioCaioRamaglio

411

New contributor

CaioRamaglio is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 10 hours ago

Peter Mortensen

13.7k1986112

edited 10 hours ago

Peter Mortensen

13.7k1986112

asked 15 hours ago

CaioRamaglioCaioRamaglio

411

New contributor

CaioRamaglio is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 15 hours ago

CaioRamaglioCaioRamaglio

411

2 Answers
2

active

oldest

votes

14

Bare except will catch exceptions you almost certainly don't want to catch, including KeyboardInterrupt (the user hitting Ctrl+C) and Python-raised errors like SystemExit

If you don't have a specific exception you're expecting, at least except Exception, which is the base type for all "Regular" exceptions.

---

That being said: you use except blocks to recover from known failure states. An unknown failure state is usually irrecoverable, and it is proper behavior to fatally exit in those states, which is what the Python interpreter does naturally with an uncaught exception.

Catch everything you know how to handle, and let the rest propagate up the call stack to see if something else can handle it. In this case the error you're expecting (per the docs) is pyautogui.ImageNotFoundException

share|improve this answer

answered 15 hours ago

Adam SmithAdam Smith

34.5k53276

add a comment | 

1

Basically, you're not taking advantage of the language to help you find problems. If you used except Exception as ex: you could do something like log the exception and know exactly what happened.

share|improve this answer

answered 15 hours ago

Charlie MartinCharlie Martin

91.7k18165242

add a comment | 

14

Bare except will catch exceptions you almost certainly don't want to catch, including KeyboardInterrupt (the user hitting Ctrl+C) and Python-raised errors like SystemExit

If you don't have a specific exception you're expecting, at least except Exception, which is the base type for all "Regular" exceptions.

---

That being said: you use except blocks to recover from known failure states. An unknown failure state is usually irrecoverable, and it is proper behavior to fatally exit in those states, which is what the Python interpreter does naturally with an uncaught exception.

Catch everything you know how to handle, and let the rest propagate up the call stack to see if something else can handle it. In this case the error you're expecting (per the docs) is pyautogui.ImageNotFoundException

share|improve this answer

answered 15 hours ago

Adam SmithAdam Smith

34.5k53276

add a comment | 

14

Bare except will catch exceptions you almost certainly don't want to catch, including KeyboardInterrupt (the user hitting Ctrl+C) and Python-raised errors like SystemExit

If you don't have a specific exception you're expecting, at least except Exception, which is the base type for all "Regular" exceptions.

---

That being said: you use except blocks to recover from known failure states. An unknown failure state is usually irrecoverable, and it is proper behavior to fatally exit in those states, which is what the Python interpreter does naturally with an uncaught exception.

Catch everything you know how to handle, and let the rest propagate up the call stack to see if something else can handle it. In this case the error you're expecting (per the docs) is pyautogui.ImageNotFoundException

share|improve this answer

answered 15 hours ago

Adam SmithAdam Smith

34.5k53276

add a comment | 

Bare except will catch exceptions you almost certainly don't want to catch, including KeyboardInterrupt (the user hitting Ctrl+C) and Python-raised errors like SystemExit

If you don't have a specific exception you're expecting, at least except Exception, which is the base type for all "Regular" exceptions.

---

That being said: you use except blocks to recover from known failure states. An unknown failure state is usually irrecoverable, and it is proper behavior to fatally exit in those states, which is what the Python interpreter does naturally with an uncaught exception.

Catch everything you know how to handle, and let the rest propagate up the call stack to see if something else can handle it. In this case the error you're expecting (per the docs) is pyautogui.ImageNotFoundException

share|improve this answer

answered 15 hours ago

Adam SmithAdam Smith

34.5k53276

share|improve this answer

answered 15 hours ago

Adam SmithAdam Smith

34.5k53276

answered 15 hours ago

Adam SmithAdam Smith

34.5k53276

answered 15 hours ago

Adam SmithAdam Smith

34.5k53276

1

Basically, you're not taking advantage of the language to help you find problems. If you used except Exception as ex: you could do something like log the exception and know exactly what happened.

share|improve this answer

answered 15 hours ago

Charlie MartinCharlie Martin

91.7k18165242

add a comment | 

1

Basically, you're not taking advantage of the language to help you find problems. If you used except Exception as ex: you could do something like log the exception and know exactly what happened.

share|improve this answer

answered 15 hours ago

Charlie MartinCharlie Martin

91.7k18165242

add a comment | 

Basically, you're not taking advantage of the language to help you find problems. If you used except Exception as ex: you could do something like log the exception and know exactly what happened.

share|improve this answer

answered 15 hours ago

Charlie MartinCharlie Martin

91.7k18165242

share|improve this answer

answered 15 hours ago

Charlie MartinCharlie Martin

91.7k18165242

answered 15 hours ago

Charlie MartinCharlie Martin

91.7k18165242

answered 15 hours ago

Charlie MartinCharlie Martin

91.7k18165242