Python Development (ii)

Python provides three built-in data structures:

List tuple Dictionaries

A. List (you can check the list, insert, delete, change)

#!/usr/bin/python#filename:using_list.pyshoplist=[' apple ', ' mango ', ' carrot ', ' banana ']print  ' i have ', Len (shoplist), ' items to purchase ' print  ' these item sare: ',for item in  Shoplist:    print item, ' \ n ' shoplist.append (' rice ') print shoplistshoplist.sort () print  ' \ n ',shoplistprint  ' \ n ',shoplist[0]del shoplist[0]print shoplist                                                                         ~                                                                          "using_list.py"  14L, 333C written                    [[email protected]~]#  python using_list.pyi have 4 items to purchasethese item sare:  apple mango carrot banana [' apple ',  ' mango ',  ' carrot ',  ' banana ',   ' rice ' [' apple ',  ' banana ',  ' carrot ',  ' mango ',  ' rice ']apple[' banana ',  ' carrot ',   ' mango ',  ' rice '

Two. Tuples (like strings, not modifiable)

Print '%s is%d years old '% (name,age)

#!/usr/bin/python#filename:print_tuple.pyage=22name= ' Swaroop ' print  '%s is %d years  Old '% (name,age) print  ' Why is %s playing with that python? ' %name~                                                                                                                                                "print_tuple.py"  [New] 6L, 152C written              [[email protected] ~]# python print_ Tuple.pyswaroop is 22 years oldwhy is swaroop playing with that  python?

Three. Dictionaries

If ' Guido ' in AB:

Print "%s"% ab[' Guido ']

#!/usr/bin/python#filename:using_dict.pyab={' Swaroop ': ' [email protected] ',     ' Larry ' : ' [email protected] ',     ' Matsumoto ': ' [email protected] ',      ' spammer ': ' [email protected] '}print  ' swaroop ' s address is %s ab[' Swaroop '] "Ab[' Guido ']= ' [email protected] ' del ab[' spammer ']print len (AB) for name,address in  ab.items ():    print  ' contact %s at a%s '% (name,address) if  ' Guido '  in ab:    print  ' \nguido ' s address is %s '% ab[' Guido ']                                                                        ~                                                                          "using_dict.py"  [New] 15L, 445C  Written             [[email protected]~] # python using_dict.pyswaroop ' s address is %s ab[' Swaroop ']4Contact Swaroop  at [email protected]Contact Matsumoto at [email protected]Contact  Larry at [email protected]contact guido at [email protected]guido ' s  Address is [email protected] 

Index

Shoplist[1:3]

Shoplist[2:]

shoplist[:]

#!/usr/bin/python#filename:seq.pyshoplist=[' apple ', ' mango ', ' canot ', ' banana ']print  ' item 0 is ', shoplist[0]print  ' Item 1 is ',shoplist[1]print  ' Item 2 is ',shoplist[2]print  ' Item 3 is ',shoplist[3]print  ' item -1 is ',shoplist[-1]print  ' Item -2  Is ',shoplist[-2]print  ' item 1 to 3 is ',shoplist[1:3]print  ' Item 2 to  end is ',shoplist[2:]print  ' item 1 to to -1 is ', shoplist[1:-1]print   ' Item start to end is ', shoplist[:]name= ' Swaroop ' print  ' characters 1  To 3 is ',name[1:3]print  ' characters 2 to end is ',name[2:]print  ' Characters 1 to -1 is ',name[1:-1]print  ' characters start to end  is  ',name[:]                                                                       "using_seq.py"  [New] 18L,  600c written[[email protected] ~]# python using_seq.pyitem 0 is  Appleitem 1 is mangoitem 2 is canotitem 3 is bananaitem -1  is bananaitem -2 is canotitem 1 to 3 is [' Mango ',  ' Canot ']item 2 to end is [' canot ',  ' banana ']item 1 to to -1  is [' Mango ',  ' canot ']item start to end is [' apple ',  ' mango ',   ' canot ',  ' banana ']characters 1 to 3 is wacharacters 2 to  End is aroopcharacters&nBsp;1 to -1 is waroocharacters start to end is  swaroop 

Method of String:

If Name.startswith (' Swa '):

If ' a ' in name:

If Name.find (' War ')!=-1:

Delimiter= ' _*_ '

Arr=[' A ', ' B ', ' C ']

Delimiter.join (arr)

A_*_b_*_c

#!/usr/bin/python#filename:str_methods.pyname= ' Swaroop ' if name.startswith (' Swa '):     print  ' Yes,the string start with swa ' if  ' a '  in name:     print  ' yes,it contains the string  ' a ' if name.find (' War ')!=-1:     print  ' yes,it contains the string  ' War ' delimiter= ' _*_ ' mylist=[' Brazil ', ' Russia ', ' India ', ' China ']print delimiter.join (mylist) ~                                                                                                                                                 ~                                                                          "str_methods.py"  12L, 344C written                   [[email protected] ~]# python str_methods.pyyes,the  string start with swayes,it contains the string  "a" yes,it contains the string  " War "Brazil_*_russia_*_india_*_china

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Python Development (ii)