beginning ruby from novice to professional

Command line run Python scriptLinux first create a hello.py[Python] View PlainCopy $ gedit hello.py Input:[Python] View PlainCopy #!/usr/bin/env python Print 2 Save exit, run:[Python] View PlainCopy $ python hello.py 4 We can also make it perform like a normal programBefore executing, let the script file have the executable properties:[Python] View PlainCopy $ chmod a+x hello.py To run the script:[Python] View PlainCopy $.

Conditions and loopsConditional execution:Name = Raw_input (' What's your name? ' If Name.endswith (' Gumby '):p rint ' Hello, Mr.gumby 'What is your name? Gumbyhello, Mr.gumbyName = Raw_input (' What's your name? ' If Name.endswith (' Gumby '):p rint ' Hello, mr.gumby ' else:print ' Hello, stranger 'Multiple conditions:num = input (' Enter a number: ') if num > 0:print ' The number is positive ' elif num Enter a number:5the number is positiveEnter A number: -1the number is negativeEnter a numbe

Beginning Python From Novice to Professional (8)-file Method File Method Read/write: #!/usr/bin/env pythonf = open('somefile.txt','w')f.write('Hello,')f.write('World!')f.close()f = open('somefile.txt','r')print f.read(5) HelloBasic file method: #!/usr/bin/env pythonf = open(r'somefile.txt')print f.read()f.close()f = open(r'somefile.txt')for i in range(3):print

Beginning Python From Novice to Professional (5)-conditions and loops Conditions and loops Conditional execution: name = raw_input('What is your name? ')if name.endswith('Gumby'):print 'Hello, Mr.Gumby' What is your name? GumbyHello, Mr.Gumby name = raw_input('What is your name? ')if name.endswith('Gumby'):print 'Hello, Mr.Gumby'else:print 'Hello, stranger'Multi

Beginning Python From Novice to Professional (3)-List Operation, pythonnovice List operations List function: >>> list('hello')['h', 'e', 'l', 'l', 'o']Change List: >>> x=[1,1,1]>>> x[1]=2>>> x[1, 2, 1]Delete element: >>> names = ['wu','li','zhao','qian']>>> del names[1]>>> names['wu', 'zhao', 'qian']Partition assignment: >>> name = list('perl')>>> name['p'

Beginning Python From Novice to Professional (2)-run the Python script on the command line, novicepython Run the Python script on the command line. Create a hello. py file in Linux $ Gedit hello. py Input: #! /Usr/bin/env pythonprint 2 + 2Save and exit. Run: $ Python hello. py 4We can also make it run like a common program. Before Execution, le

Beginning Python From Novice to Professional (9)-Socket, pythonnovice Socket Small servers: #!/usr/bin/env pythonimport sockets = socket.socket()host = socket.gethostname()port = 1234s.bind((host,port))s.listen(5)while True:c,addr = s.accept()print 'Got connection from',addrc.send('Thank you for connecting')c.close()Small client: #!/usr/bin/env pythonimport so

', ' little ', ' dog ']>>> sentence.index (' Little ') 3Insert inserts an object into the list:>>> num = [1,2,3,5,6,7]>>> num.insert (3, ' four ') >>> num[1, 2, 3, ' Four ', 5, 6, 7]Pop removes the list element, the last one by default:>>> x = [1,2,3]>>> x.pop () 3>>> x[1, 2]>>> x.pop (0) 1>>> x[2]Combined Append:>>> x = [1,2,3]>>> x.append (X.pop ()) >>> x[1, 2, 3]Remove removes the first occurrence from the list:>>> x = [' To ', ' is ', ' or ', ' not ', ' to ', ' is ']>>> x.remove (' is ') >>

$ gedit price.py#!/usr/bin/env pythonwidth = input (' Please enter width: ') price_width = 10item_width = Width-price_widthheader_format = '%-*s%*s ' format = '%-*s%*.2f ' print ' = ' * widthprint header_format% (item_width, ' item ', Price_width, ' price ') print ' -' * widthprint format% (item_width, ' Apples ', price_width,0.4) print format% (item_width, ' Pears ', price_width,0.5) print Format% (item_width, ' cantaloupes ', price_width,1.92) print format% (item_width, ' apricots ', pr

Beginning Python From Novice to Professional (1)-numbers and expressions, pythonnovice Numbers and expressions Addition, subtraction, multiplication, division: >>> 2 + 24 >>> 100-5050 >>>> 3*515 >>>> 1/20/2.00.5Remainder and multiplication: >>> 1% 21 >>> 10% 31 >>> 2 ** 38 >>>-3 ** 2-9 >>> (-3) ** 29Hexadecimal, octal: >>> 0xff255 >>> 02016Variable

] >>> X.append (X.pop ()) >>> x [1, 2, 3] Remove removes the first occurrence from the list:[Python] View PlainCopy >>> x = [' to ',' is ', 'or ',' not ',' to ',' is '] >>> x.remove (' be ') >>> x [' to ', ' or ', ' no ', ' to ', ' being '] Reverse Reverse storage elements:[Python] View PlainCopy >>> x = [1,2,3] >>> X.reverse () >>> x [3, 2, 1] Sort order:[Python] View PlainCopy >>> x = [4,6,2,1,7,9]

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