Handling errors & Exceptions

#File Not Found
with open("a_file.txt") as file:
	file.read()

#KeyError
a_dictionary = {"key": "value"}
value = a_dictionary{"non_existent_key"}

#IndexError
fruit_list = ["Apple", "Banana", "Pear"}
fruit = fruit_list[3]

#TypeError
text = "abc"
print(text + 5)

Catching Exceptions

• try: Something that might cause an exception
• except: Do this if there was an exception
• else: Do this if there were no exceptions
• finally: Do this no matter what happens

#File Not Found

try:
	file = open("a_file.txt")
	a_dictionary = {"key": "value"}
	print(a_dictionary["key"]

except FileNotFoundError:
	file = open("a_file.txt", "w")
	file.write("Something")

except Keyerror as error_message:
	print(f"That key {error_message} does not exist.")

else:
	content = file.read()
	print(content)

finally:
	file.close()
	print("File was closed")