What's your name?
In the last lesson, we saw how to print "Hello, world" and other things. But writing print statements every time may not be the best idea. Why not store our stuff in containers called variables?
For example, writing or printing your name like this:
name = "Pulkit"
print(name)
Python Fundamentals
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Now, if you wish to assign something else to this name variable, like a friend's name, you can do so.
name = "Mohan"
print(name)
This will print:
Mohan
Notice how the same variable stores this new value "Mohan". Python will always use the latest value assigned to a variable.
You can use variables of your choice. More examples:
pi = 3.14
x = 10
y = -1
Explanation:
We're assigning 3.14 to a variable called pi. Here, = is not an equality sign in Python; rather, it's used for assigning values from right (3.14) to left (pi). Similarly, we've assigned 10 and -1 to variables x and y respectively. Note: Numbers are not written inside "".
hello
Learn more about the different rules for naming variables here.
How it works?
Remember, Python interpreter reads the code from top to bottom and from left to right.
name = "Pulkit"
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Thus, on line 1, the word "Pulkit" is assigned to a variable called name. Now, "Pulkit" lives inside this new variable name.
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On the second line, we can use our print statement with the name variable inside the parentheses. Notice that we're not quoting the name inside "" as it is a variable consisting of some value.
Variable Lab
Results
Let's make some mistakes:
name = "Ram"
print(Name)
You'll get a NameError because the variable name in line two, Name, is not described before. We're using name, but we mistakenly wrote Name. Try now:
Your results will appear below.
Correct Variable Name
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See more at Python documentation.
Thank you for learning!