If a software language is easy in terms of declaring variables, then consider that half of the time and efforts are saved. Python is one of the easiest and convenient languages for declaring variables.”
If a software language is easy in terms of declaring variables, then consider that half of the time and efforts are saved. Python is one of the easiest and convenient languages for declaring variables.”
If a software language is easy in terms of declaring variables, then consider that half of the time and effort are saved. Python is one of the easiest and most convenient languages for declaring variables. We will dive deep into the variables of Python, their rules of declaration, and basic information about variables.
=
operator.# Declare string
name='john doe'
name
'john doe'
Python# Declaring integer
num=5
num
5
Python# Declaring Float
pi=3.14
pi
3.14
PythonWhat to consider before naming variables?
Rule 1: Variable names must not start with numbers.
# declare variable five
five=5
print(five)
5
Python# declare variable f5
f5=5
print(f5)
5
PythonRule 2: Variable names must not include these special symbols.
, < > / + @ – ‘ “” : ? # % ^ & * ~ | \ !
# using special symbol & in variable.
jacknjill='hill'
# using special symbol @ in variable.
johndoemail='johndoe@gmail.com'
print(jacknjill)
print(johndoemail)
hill
johndoe@gmail.com
PythonRule 3: Names cannot contain spaces; use _ instead.
# avoid using special symbol @ in variable.
john_doe_at_age=20
# use _ instead of blank spaces.
john_doe_age=20
print(john_doe_at_age)
print(john_doe_age)
20
20
PythonRule 4: Variable names must not contain Python’s keywords.
# Don't use a keyword for a variable.
if=5
File "<ipython-input-9-5719a260f2d6>", line 2
if=5
^
SyntaxError: invalid syntax
Python# Assign multiple variables the same value at once.
d=e=f=110
print(d)
print(e)
print(f)
110
110
110
Pythonpi=3.14 # Store value of pie in pi
print(pi)
3.14
Python# print type of pi
type(pi)
float
PythonLet’s change pi’s datatype to an integer with int().
# type cast pi into integer
int(pi)
3
PythonLet’s convert a number stored in string format to an integer with int().
# store string in alphabets
alphabets='6798'
print(alphabets)
print(type(alphabets))
# typecast alphabets into integer.
int(alphabets)
6798
<class 'str'>
6798
PythonLet’s explain the local variable with a simple function.
# element1 is global variable.
# element2 is local variables in the chemist function.
element1 = "methane"
def chemist():
element2 = "ethane"
element2 = element2 + element1
print(element2)
chemist()
ethanemethane
PythonAs you see above, the variable element1 is declared above the scope of chemist(), so it is available to all child
scopes in it.
Element2 is declared in the chemist() function, so it is exclusive to the chemist() and its child scopes only.
print(element1)
methane
PythonIf you try to access local variables outside their scope, this error will occur, but element 1 is accessed in the function despite being in a different scope. Because it was accessed within its sub-scope. You can access the variables from the parent scopes.
There is a way to access the local scope variables outside the scope. If we declare the local variables as global with a global
keyword.
# element1 is global variable.
# element2 is local variables in the chemist function.
element1 = "methane"
def chemist():
global element2
element2 = "ethane"
element2 = element1 + element2
return element2
chemist()
print(element2)
methaneethane
Python# accessing element2 has been made global
print(element2)
# access the local variable through chemist() function.
print(chemist())
methaneethane
methaneethane
PythonAs you can see above, if you declare a variable with the global keyword, it becomes accessible in all scopes. Be careful with using global; it may create discrepancies in the security of working systems.
You can delete a variable in Python by using the ‘del'
keyword.
Syntax: del variable_name
#store value of pie
pie=3.146
print(pie)
3.146
Python# delete pie
del pie
%who pie
No variables match your requested type.
PythonIn the above code, we used %who pie to find the deleted variable.
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