Python assignment help
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![Strings
• ‘Hello’+ ‘World’ ‘HelloWorld’ # Concatenation
• ‘Hello’*2 ‘HelloHello’ # Repetition
• ‘Hello’[0] ‘h’ # Indexing
• ‘Hello’[-1] ‘o’ # (From end)
• ‘Hello’[1:4] ‘ell’ # Slicing
• len(‘Hello’) 5 # Size
• ‘Hello’< ‘jello’ 1 # Comparison
• ‘e’ in ‘hello’ 1 # Search
• ‘escapes: n etc, 033 etc, if etc’
• 'single quotes' """triple quotes""" r ‘raw strings’
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![Lists
• Variable arrays, definitely, not Lisp-like
linked lists
• x = [99, [‘on’, ‘the’, ‘wall’]]
• Exact same providers for strings
• x+y, x*3, x[0], x[-1], x[1:], len(x)
• Item and slice assignment
• x[0] = 98
-> [98, [‘on’, ‘the’, ‘wall’]]
• del x[-1] # -> [98]
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![Tuples
• Tuples tend to be
immutable versions
associated with lists
• One strange may be the
structure to create a tuple
along with one element:
‘,’ is required to
differentiate from the
numerical expression (2)
>>>> a = (1,2,3)
>>> >a[1:]
(2, 3)
>>>> b = (2,)
>>> >b
(2,)
>>> >
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![Dictionaries
• Some key-value sets
• Dictionaries tend to be mutable
>>> x = {1 : ‘Welcome', ‘Two' : 32, ‘Hi' : [4,5,6]}
>>> x
{1: ‘Welcome', ‘Two': 32, ‘Hi': [1, 2, 3]}
>>> x[‘Hi']
[4,5,6]
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Python assignment help
- 2. What is Python • Multi-purpose i.e, Web, Graphical user interface (GUI), Scripting and many others. • Strongly typed as well as dynamically typed. • Focus on readability as well as productivity. • Object oriented. • Interpreted. www.myassignmenthelp.net
- 3. Characteristics • Easy to Learn • High-level Language • Interactive shell • Strong introspection • Cross platform • Object Oriented • Everything is an object • Free and Open Source www.myassignmenthelp.net
- 4. CONT.. • Useful built-in types (lists, dictionaries) • Clean syntax, powerful extensions • Interpreted • Interactive • Commonly used for producing HTML content on websites. Great for text files • Functional • Extensive Libraries www.myassignmenthelp.net
- 5. Languages www.myassignmenthelp.net • Few important types: – FORTRAN • Technology – COBOL • Business Information – LISP • Logic as well as AI – BASIC • Easy Language
- 6. The Python Interpreter • Python can be an interpreted terminology • The actual interpreter has an interactive environment in order to perform using the language • Results >>>> 4 + 5 9 >>>> 4 < 15 True >>>> “print me” “print me” >>>> print “print me” print me >>> > www.myassignmenthelp.net
- 7. Print “Hello World” • Open a terminal window and type ‘python’ • If on Windows open a Python IDE such as IDLE • At the prompt type “Hello World !!” >>>> ‘Hello World !!' ‘Hello World !!' www.myassignmenthelp.net
- 8. The print Statement >>>> print “Welcome” Welcome >>>> print “Welcome”, “Ram” Welcome Ram • Elements divided through commas , print with a space between them • The comma at the end from the statement (print “Welcome”,) won't printing the new line character www.myassignmenthelp.net
- 9. The Documentation >>> > “welcome' ‘welcome' >>> #‘comment' >>> ‘#’ : this symbol is used for starts a comment www.myassignmenthelp.net
- 10. Variables • Do not need to declare • Should determine (initialize) • Using uninitialized variable improves exception • Certainly not typed in case ,friendly: greeting = “Hello World" else: greeting = 12**2 print greeting • Anything is often a ‘variable’: • Even characteristics, classes, modules www.myassignmenthelp.net
- 11. Everything is an object • Everything means, which includes functions as well as classes • Data type is usually a property of the object instead of on the variable >>>> x = 9 >>> x 9 >>>> x = “Welcome” >>>> x “Welcome” >>>> www.myassignmenthelp.net
- 12. Interactive “Shell” • This is good for learning the language • Good for experimenting for using your library • Good for testing for using your own modules • 2 variants: IDLE (GUI), python (command line) • Kind statements or even expressions at prompt: www.myassignmenthelp.net >>>> print "Hello, World" Hello, World >>>> x = 12**2 >>>> x/2 72 >>>> # (this is a comment)
- 13. Numbers • The typical suspects: • 13, 3.15, 0xFF, 0377, (-1+2)*3/4**5, abs(x), 0<x<=5 • C-style shifting & masking: • 1<<17, x&0xff, x|1, ~x, x^y • Integer division truncates: • 1/2 -> 0 # 1./2. -> 0.5, float(1)/2 -> 0.5 • fixed in the future • Long complicated: • 2L**100 -> 1267650600228229401497607505376L – Within Python 2.2 as well as past, 2**100 will the same www.myassignmenthelp.net
- 14. Strings • ‘Hello’+ ‘World’ ‘HelloWorld’ # Concatenation • ‘Hello’*2 ‘HelloHello’ # Repetition • ‘Hello’[0] ‘h’ # Indexing • ‘Hello’[-1] ‘o’ # (From end) • ‘Hello’[1:4] ‘ell’ # Slicing • len(‘Hello’) 5 # Size • ‘Hello’< ‘jello’ 1 # Comparison • ‘e’ in ‘hello’ 1 # Search • ‘escapes: n etc, 033 etc, if etc’ • 'single quotes' """triple quotes""" r ‘raw strings’ www.myassignmenthelp.net
- 15. Lists • Variable arrays, definitely, not Lisp-like linked lists • x = [99, [‘on’, ‘the’, ‘wall’]] • Exact same providers for strings • x+y, x*3, x[0], x[-1], x[1:], len(x) • Item and slice assignment • x[0] = 98 -> [98, [‘on’, ‘the’, ‘wall’]] • del x[-1] # -> [98] www.myassignmenthelp.net
- 16. Tuples • Tuples tend to be immutable versions associated with lists • One strange may be the structure to create a tuple along with one element: ‘,’ is required to differentiate from the numerical expression (2) >>>> a = (1,2,3) >>> >a[1:] (2, 3) >>>> b = (2,) >>> >b (2,) >>> > www.myassignmenthelp.net
- 17. Dictionaries • Some key-value sets • Dictionaries tend to be mutable >>> x = {1 : ‘Welcome', ‘Two' : 32, ‘Hi' : [4,5,6]} >>> x {1: ‘Welcome', ‘Two': 32, ‘Hi': [1, 2, 3]} >>> x[‘Hi'] [4,5,6] www.myassignmenthelp.net
- 18. Standard Library • Core: – operating system, sys, string, StringIO, struct, pickle etc • Regular expressions: – re module, Perl-5 style patterns as well as matching rules • Web: – socket, rfc822, httplib, htmllib etc • Miscellaneous: – pdb – Tkinter, audio etc www.myassignmenthelp.net