According to PEP8, you should name long variables names like this- long_variable_name with underscores.<\/li>\n<\/ul>\nAssigning Variables<\/h3>\n
Like we said, we do not declare variables, we assign them.<\/p>\n
This is how we assign a variable:<\/p>\n
name=\u2018TechVidvan\u2019\r\n\r\nname=8<\/pre>\nThe variable name has the value \u2018TechVidvan\u2019<\/strong>, but later, it has the value 8<\/strong>. This is possible.<\/p>\nWe cannot assign a variable to a value<\/strong>.<\/p>\n8=name<\/pre>\nSyntaxError<\/strong>: can’t assign to literal<\/p>\nThis gives us a SyntaxError as we cannot assign to a literal<\/strong>. You can also use foreign characters in variable names. There are many ways to assign variables.<\/p>\nLet\u2019s see them.<\/p>\n
1. Assigning Multiple Variables<\/h4>\n
You can assign different values to multiple variables in a statement.<\/p>\n
fname, lname=\u2018Lucifer\u2019, \u2018Satan\u2019<\/pre>\nHere, fname<\/strong> is \u2018Lucifer\u2019 and lname<\/strong> is \u2018Satan\u2019. We can assign values to both fname and lname in one statement<\/strong>.<\/p>\n2. Assigning Single Value<\/h4>\n
You can also assign a single value to many variables.<\/p>\n
fname=lname=\u2019Satan\u2019<\/pre>\nIn this, fname and lname both are \u2018Satan\u2019<\/strong>.<\/p>\n3. Incrementing before Assigning Value<\/h4>\n
You do not need to declare a variable in Python, you can assign to it. But you cannot increment<\/strong> or change<\/strong> its value if you have not assigned a value to it.<\/p>\n>>> Adolf+=2<\/pre>\nOutput:<\/strong><\/p>\nTraceback (most recent call last):
\n
\u00a0\u00a0<\/span>File “<pyshell#25>”, line 1, in <module>
\n\u00a0\u00a0\u00a0\u00a0<\/span>Adolf+=2
\nNameError: name ‘Adolf’ is not defined<\/div>\nFirst, you should assign a value to Adolf<\/strong>. Then you can modify<\/strong> it.<\/p>\n>>> Adolf=2\r\n>>> Adolf+=2\r\n>>> print(Adolf)<\/pre>\nOutput:<\/strong><\/p>\n4<\/div>\n
4. Reassigning the Variables<\/h4>\n
Like I said before, variables can hold different type of values any time.<\/p>\n
>>> dementor=2\r\n>>> dementor='DF'<\/pre>\nThe dementor<\/strong> variable was holding the value 2 but now it holds the \u2018DF\u2019<\/strong> string.<\/p>\nScope-Local, Nonlocal and Global Variables<\/h3>\n
You can declare local and global variables in Python.<\/p>\n
Let\u2019s start with global.<\/p>\n
1. Global Variables<\/h4>\n>>> count=2\r\n>>> def func():\r\n count+=1\r\n print(count)<\/pre>\n>>> func()<\/pre>\nOutput:<\/strong><\/p>\nTraceback (most recent call last):
\n
\u00a0\u00a0<\/span>File “<pyshell#37>”, line 1, in <module>
\n\u00a0\u00a0\u00a0\u00a0<\/span>func()
\n\u00a0\u00a0<\/span>File “<pyshell#36>”, line 2, in func
\n\u00a0\u00a0\u00a0\u00a0<\/span>count+=1
\nUnboundLocalError: local variable ‘count’ referenced before assignment<\/div>\nWe cannot increment count in func because it looks for a local count<\/strong>. So the output is not 3, it is an UnboundLocalError<\/strong>.<\/p>\nWe can use the global keyword inside func<\/strong> to let it work.<\/p>\n>>> count=2\r\n>>> def func():\r\n global count\r\n count+=1\r\n print(count)\r\n\r\n\r\n>>> func()<\/pre>\nOutput:<\/strong><\/p>\n3<\/div>\n
Now it works.<\/p>\n
This func function adds 1 to global count<\/strong> and prints it.<\/p>\n2. Local Variables<\/h4>\n
In our previous example, count was defined outside the func<\/strong> and hence it was in global scope, now we will define count in the local scope<\/strong> by defining it inside the func function and then you can observe that local variable<\/strong> and global variables<\/strong> have different scopes<\/strong>.<\/p>\n>>> count=2\r\n>>> def func():\r\n count = 10\r\n count+=1\r\n print(count)\r\n\r\n>>>func()\r\n>>>print(count)<\/pre>\nOutput: <\/strong><\/p>\n11
\n2<\/div>\n
3. Nonlocal Variables<\/h4>\n
When there are nested functions<\/strong>, the inner function can use variable from the outer function using the nonlocal keyword<\/strong>.<\/p>\n>>> def func1():\r\n achievements=9\r\n def func2():\r\n nonlocal achievements\r\n achievements+=2\r\n print(achievements)\r\n func2()\r\n\r\n\r\n>>> func1()<\/pre>\nOutput:<\/strong><\/p>\n11<\/div>\n
Deleting Variables<\/h3>\n
If you use the del keyword<\/strong>, you can delete a variable in Python.<\/p>\nLet\u2019s define a variable and delete it.<\/p>\n
>>>wannabe=2\r\n>>>del wannabe\r\n>>>print(wannabe)<\/pre>\nOutput:<\/strong><\/p>\nTraceback (most recent call last):
\n
\u00a0\u00a0<\/span>File “<pyshell#63>”, line 1, in <module>
\n\u00a0\u00a0\u00a0\u00a0<\/span>print(wannabe)
\nNameError: name ‘wannabe’ is not defined<\/div>\nAfter you delete it, you cannot access it. It gives you a NameError<\/strong> exception.<\/p>\nThe + Operator<\/h3>\n
You can join or concatenate two or more variables with the concatenation<\/strong> operator.<\/p>\nThe +<\/strong> sign is the concatenation operator.<\/p>\n>>> name='Lucifer'\r\n>>> lname='Satan'\r\n>>> name+lname<\/pre>\nOutput:<\/strong><\/p>\n‘LuciferSatan’<\/div>\n
This operator performs addition<\/strong> on integers and on floats.<\/p>\n>>> 7+7.5<\/pre>\nOutput:<\/strong><\/p>\n14.5<\/div>\n
You cannot add an integer<\/strong> and a string<\/strong>.<\/p>\n>>> 7+name<\/pre>\nOutput:<\/strong><\/p>\nTraceback (most recent call last):
\n
\u00a0\u00a0<\/span>File “<pyshell#68>”, line 1, in <module>
\n\u00a0\u00a0\u00a0\u00a0<\/span>7+name
\nTypeError: unsupported operand type(s) for +: ‘int’ and ‘str’<\/div>\nSummary<\/h3>\n
This was all about Python variables.<\/p>\n
Today, we learned about variables<\/strong> in Python and how to define, use and delete them. We learned about local<\/strong>, global<\/strong> and nonlocal<\/strong> variables<\/strong> and about naming<\/strong> and assigning<\/strong>.<\/p>\nI hope that our Python variables article was helpful to you.<\/p>\n","protected":false},"excerpt":{"rendered":"
Let’s dive into the world of variables in Python! In this tutorial, we’ll explore how to name, use, and delete variables. But first, let’s start with the basics: what exactly are variables in Python?...<\/p>\n","protected":false},"author":1,"featured_media":74212,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1053],"tags":[1076,1077,1078,1079,1080,1081,1082],"class_list":["post-74204","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python","tag-python-assigning-variables","tag-python-global-variables","tag-python-naming-variables","tag-python-variables","tag-the-operator","tag-variables-in-python","tag-what-are-variables"],"yoast_head":"\n
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![\"Variables](\"https:\/\/techvidvan.com\/tutorials\/wp-content\/uploads\/sites\/2\/2019\/12\/python-variables.jpg\")
<\/a><\/h3>\n