University:
California State University, Northridge
Course:
MATH 382/L | Introduction to Scientific Computing and Lab
Academic year:

2020
Views:

417

Pages:

2
Author:

esfredint7qo

Variables: ï ï ï ï One of the most powerful features of a programming language is the ability to manipulate +variables .+ A variable is a name that refers to a value. It is the memory location to stored values. Variable assignment using 8=9 operator. A variable is a type of +identifier . Rules for naming identifiers: ï ï ï The first character of the identifier must be a letter of the alphabet (uppercase ASCII or lowercase ASCII or Unicode character) or an underscore (_). The rest of the identifier name can consist of letters (uppercase ASCII or lowercase ASCII or Unicode character), underscores (_) or digits (0-9). Identifier names are case-sensitive. For example, myname and myName are not the same. Note the lowercase n in the former and the uppercase N in the latter. Examples of valid identifier names are i, name_2_3. Examples of invalid identifier names are 2things, this is spaced out, my-name and >a1b2_c3. Python reserves 33 keywords: del+ +from elif+ +global else+ +if except+ +import False+ +in None+ +True nonlocal+ +try not+ +while or+ +with pass+ +yield and as assert break class continue+ +finally+ +is+ def+ +for+ +lambda+ +raise +return Major data types: ï Numbers ï String ï Complex ï List ï Tuple ï Dictionary z=+20+ +#number x=+"this is a string"+ +#string y=[+1+,+2+,+3+,+4+] #list p={+15+,+6+,+7+} #tuple r={a:+5+} #dictionary There are three numeric data types: 1. int (integers) 2. float (floating point real values) 3. complex (complex numbers) a=+10+ +# int b= +12.6+ +# float c= +5j+ +# complex

Python Variables

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