What’s wrong with my except? [duplicate]
You use python3 and in python3 the raise syntax no longer accepts comma-separated arguments. Use as instead: except getopt.GetoptError as e: This form is also backwards-compatible with 2.6 and 2.7.
except
How does LINQ Except work? [duplicate]
Taken from 101 LINQ Samples: int[] numbersA = { 0, 2, 4, 5, 6, 8, 9 }; int[] numbersB = { 1, 3, 5, 7, 8 }; IEnumerable<int> aOnlyNumbers = numbersA.Except(numbersB); Console.WriteLine(“Numbers in first array but not second array:”); foreach (var n in aOnlyNumbers) { Console.WriteLine(n); } Result Numbers in first array but not second … Read more
Python try block does not catch os.system exceptions
If you want to have an exception thrown when the command doesn’t exist, you should use subprocess: import subprocess try: subprocess.run([‘wrongcommand’], check = True) except subprocess.CalledProcessError: print (‘wrongcommand does not exist’) Come to think of it, you should probably use subprocess instead of os.system anyway …
Catch KeyError in Python
If it’s raising a KeyError with no message, then it won’t print anything. If you do… try: connection = manager.connect(“I2Cx”) except Exception as e: print repr(e) …you’ll at least get the exception class name. A better alternative is to use multiple except blocks, and only ‘catch’ the exceptions you intend to handle… try: connection = … Read more
What is wrong with using a bare ‘except’? [duplicate]
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 … Read more
Using python “with” statement with try-except block
The two code blocks you gave are not equivalent The code you described as old way of doing things has a serious bug: in case opening the file fails you will get a second exception in the finally clause because f is not bound. The equivalent old style code would be: try: f = open(“file”, … Read more
Multiple try codes in one block
You’ll have to make this separate try blocks: try: code a except ExplicitException: pass try: code b except ExplicitException: try: code c except ExplicitException: try: code d except ExplicitException: pass This assumes you want to run code c only if code b failed. If you need to run code c regardless, you need to put … Read more
Safe method to get value of nested dictionary
You could use get twice: example_dict.get(‘key1’, {}).get(‘key2’) This will return None if either key1 or key2 does not exist. Note that this could still raise an AttributeError if example_dict[‘key1’] exists but is not a dict (or a dict-like object with a get method). The try..except code you posted would raise a TypeError instead if example_dict[‘key1’] … Read more
python exception message capturing
You have to define which type of exception you want to catch. So write except Exception, e: instead of except, e: for a general exception (that will be logged anyway). Other possibility is to write your whole try/except code this way: try: with open(filepath,’rb’) as f: con.storbinary(‘STOR ‘+ filepath, f) logger.info(‘File successfully uploaded to ‘+ … Read more