Python Fundamentals
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PYTHON FUNDAMENTALS
VINOD KUMAR VERMA, PGT(CS), KV OEF KANPUR & SACHIN BHARDWAJ, PGT(CS), KV NO.1 TEZPUR
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Python Character Set
Is a set of valid characters that python can recognize. A character represent letters, digits or any symbol. Python support UNICODE encoding standard. Following are the Python character set
Letters
: A-Z, a-z
Digits
: 0-9
Special symbols :space +-*/()~`!@#$%^ & [{ ]};:",/?
White spaces
: Blank space, Enter, Tab
Other character : python can process all ASCII and UNICODE as a part of data or literal
VINOD KUMAR VERMA, PGT(CS), KV OEF KANPUR & SACHIN BHARDWAJ, PGT(CS), KV NO.1 TEZPUR
TOKENS
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In a passage of text, individual words and punctuation marks are called tokens or lexical units or lexical elements. The smallest individual unit in a program is known as Tokens. Python has following tokens:
Keywords Identifiers(Name) Literals Operators Punctuators
VINOD KUMAR VERMA, PGT(CS), KV OEF KANPUR & SACHIN BHARDWAJ, PGT(CS), KV NO.1 TEZPUR
KEYWORDS
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Keywords are the reserved words and have special meaning for python interpreter. Every keyword is assigned specific work and it can be used only for that purpose.
A partial list of keywords in Python is
VINOD KUMAR VERMA, PGT(CS), KV OEF KANPUR & SACHIN BHARDWAJ, PGT(CS), KV NO.1 TEZPUR
IDENTIFIERS
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Are the names given to different parts of program like variables, objects, classes, functions etc. Identifier forming rules of Python are :
Is an arbitrarily long sequence of letters and digits The first character must be letter or underscore Upper and lower case are different The digits 0-9 are allowed except for first character It must not be a keyword No special characters are allowed other than underscore is allowed. Space not allowed
VINOD KUMAR VERMA, PGT(CS), KV OEF KANPUR & SACHIN BHARDWAJ, PGT(CS), KV NO.1 TEZPUR
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