Because you’ve described a hi there focus on variable Along with the as keyword, now that variable retains a reference for the file object alone. You affirm this by printing the thing and its memory tackle. Eventually, the for loop iterates around the lines and prints this articles on the screen.
Variables can be a essential cornerstone in each piece of code, and assignment statements Provide you with finish Handle in excess of variable generation and mutation.
For example, mention that you should develop a dictionary-like course that suppliers its keys in lowercase letters:
Copied! Everytime you do a little something such as this as part of your code, go ahead and substitute it with a more readable iterable unpacking making use of just one and elegant assignment, like in the next code snippet:
There’s a remaining detail to keep in mind when using the as specifier inside of a consider … besides block such as one in the above mentioned instance. When you allow the except block, the concentrate on variable goes out of scope, and you'll’t utilize it any longer.
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Copied! If you try to employ among the list of previously declared variables in an augmented assignment, Then you really get yourself a NameError because the annotation syntax doesn’t outline the variable. To actually outline it, you need to use an assignment.
You can’t use Python keyword phrases as variable names in assignment statements. This kind of assignment is explicitly forbidden. If you are trying to employ a keyword being a variable identify in an assignment, You then obtain a SyntaxError:
In case you operate this code on the Laptop or computer, Then you definitely’ll get a distinct memory tackle mainly because this benefit may differ from execution to execution and Personal computer to Laptop.
Any time you make use of a variable name as being the still left operand in an assignment assertion for the first time, you’re developing a new variable. Simultaneously, you’re initializing the variable to level to the value of the correct operand.