"Head first Python" 1. Python everyone loves the list

#Coding:utf-8#Create a simple python listMovies = ["The Holy Grail",          "The life of Brain",          "The meaning of life"]#can be placed on the same line, but separate will be easier to read#as well as arrays, the items of the list start from zeroPrintMovies[1]#>>>the Life of BrainPrintMovies#>>>[' The Holy Grail ', ' The Life of Brain ', ' The Meaning of life 'Printlen (Movies)#>>>3#add append () to the tail of the list, or delete the pop () data item, and add a collection of data items at the end extend ()Movies.pop ()PrintMovies#>>>[' The Holy Grail ', ' The Life of Brain 'Movies.append ("my movie")PrintMovies#>>>[' The Holy Grail ', ' The Life of Brain ', ' my movie ']Movies.extend (["another movie_1","another movie_2"])PrintMovies#>>>[' The Holy Grail ', ' The Life of Brain ', ' My movie ', ' Another movie_1 ', ' another movie_2 '#Locate and delete a specific item in the list remove () to insert a data item before a specific item insert ()Movies.remove ("my movie")PrintMovies#>>>[' The Holy Grail ', ' The Life of Brain ', ' Another movie_1 ', ' another movie_2 'Movies.insert (2,"Insert Movie")#The first parameter is the position, the second is the item to be insertedPrintMovies#>>>[' The Holy Grail ', ' The Life of Brain ', ' Insert movie ', ' Another movie_1 ', ' another movie_2 '#add more data to a list#now we're going to add the release year of the movie to each movie name, the year is a number, and Python allows you to mix the types in the listMovies = ["The Holy Grail",          "The life of Brain",          "The meaning of life"]#Initialize list#Scenario One: Insert yearMovies.insert (1,1975) Movies.insert (3,1979)#Note that each insertion of a list length expands by oneMovies.append (1983)PrintMovies#>>>[' The Holy Grail ', 1975, ' The Life of Brain ', 1979, ' The Meaning of Life ', 1983]Movies= ["The Holy Grail",          "The life of Brain",          "The meaning of life"]#Initialize list#Scenario Two: Construct a list from scratchMovies = ["The Holy Grail", 1975,          "The life of Brain", 1979,          "The meaning of life", 1983]PrintMovies#>>>[' The Holy Grail ', 1975, ' The Life of Brain ', 1979, ' The Meaning of Life ', 1983]" "The second approach is better for small lists, such as now, without complicated operations ." "#working with List data#the use of iterations, for loops can be applied to any size of the list forEach_flickinchMovies:PrintEach_flick" "Each output statement wraps >>>the Holy grail1975the Life of brain1979the meaning of Life1983" "" "strings are Python case sensitive using single and double quotes" "#store lists in a list (nested lists)Movies = ['The Holy Grail', 1975,'The life of Brain', 1979, ["Graham Chapman",["Michael Palin","John Cleese","Terry Gilliam","Eric Idle"]]]#to print an item in a listPrintMovies[4][1][2]#>>>terry Gilliam#print each item in a nested list forEach_iteminchMovies:PrintEach_item" ">>>the Holy grail1975the Life of brain1979[' Graham Chapman ', [' Michael Palin ', ' John Cleese ', ' Terry Gilliam ', ' Eric Idle ' ]" "#The next layer of nested lists is printed back as it is, and a mechanism is needed to discover that an item in the list actually resembles a list#find a list in the list If...else#what are the criteria used for judging? Python has a built-in BIF that is available, isinstance (), to check if a particular identifier contains data of a particular typename = ['Micheael','Terry']a=isinstance (name,list)Printa#>>>trueNum_name =Len (name) a=isinstance (num_name,list)Printa#>>>false#The return value of the function is true or false#Bif has more than 71, use DIR (__builtins__) query Python's built-in method table, specific query using Help (a bif)#overriding causes nested lists to be printed item -by-pieceMovies = ['The Holy Grail', 1975,'The life of Brain', 1979,          ["Graham Chapman",["Michael Palin","John Cleese","Terry Gilliam","Eric Idle"]]] forIteminchMovies:ifisinstance (item,list): forItem_2inchItem:ifisinstance (item_2,list): forIinchitem_2:PrintIElse:                Printitem_2Else:        PrintItem" ">>> The Holy grail1975the life of Brain1979graham Chapmanmichael Palinjohn cleeseterry gilliameric idle" "#but each additional layer of nesting, you need to write a layer of repetitive code to judge and print#do not repeat code, you should create a function#functions need to be called repeatedly to call themselves within the function code groupdefprint_lol (the_list): forIteminchthe_list:ifisinstance (item,list): Print_lol (item)Else:            Printitemprint_lol (Movies)" ">>>the Holy grail1975the Life of Brain1979graham Chapmanmichael palinjohn cleeseterry GilliamEric Idle" "#that's great, recursion doesn't have to change any code to handle nested lists of any depth.#The first chapter is over here. =w=

This article original, reproduced please indicate the source http://www.cnblogs.com/Archimedes/p/7140622.html

"Head first Python" 1. Python everyone loves the list