Hashes and databases

Scores={}result_f=open ("Results.txt") for line in Result_f:    (Name,score) =line.split ()    scores[score]= Nameresult_f.close () print ("The top scores were:") for Each_score in Scores.keys ():    print (' name: ' +scores[each_score] + ' score: ' +each_score)

　　

To add a sort method:

Scores={}result_f=open ("Results.txt") for line in Result_f:    (Name,score) =line.split ()    scores[score]= Nameresult_f.close () print ("The top scores were:") for Each_score in sorted (Scores.keys (), reverse=true):    print (' Name: ' +scores[each_score]+ ' score: ' +each_score '

　　

The data becomes complex:

Line= "101; Johnny ' Wave-boy ' Jones; usa;8.65; Fish;21 "s={} (s[' id '],s[' name '],s[' country '],s[' average '"],s[' board '],s[' age ']) =line.split (";") Print ("ID:          " +s[' id ') print ("Name:        " +s[' name ']) print ("Country:     " +s[' country ') "Print (" Average:     " +s[' average ') print ("Board type:  " +s[' Board ') "Print (" Age:         "+s[' age ')

　　

Python 3.4.3 (v3.4.3:9b73f1c3e601, Feb, 22:43:06) [MSC v.1600 + bit (Intel)] on Win32type "copyright", "credits" or "license ()" For more information.>>> ================================ RESTART =========================== =====>>> ID:          101Name:        Johnny ' Wave-boy ' jonescountry:     usaaverage:     8.65Board Type:  Fishage:         

Further improvements:

def find_details (id2find):    surfers_f=open ("Surfing_data.csv") for    each_line in Surfers_f:        s={}        (s[ ' id '],s[' name '],s[' country '],s[' average '],s[' board '],s[' age ']) =each_line.split (";")        If Id2find==int (s[' id '):            surfers_f.close ()            return (s)    surfers_f.close ()    return (s) lookup_id=int ( Input ("Enter the ID of the Surrfer:")) Surfer=find_details (lookup_id) if surfer:    print ("ID:          " +surfer[' ID ']) Print (    "Name:        " +surfer[' name ')    print ("Country:     " +surfer[' country ')    "Print (" Average:     "+surfer[' average ')    " Print ("Board type:"  +surfer[' Board ')    print ("Age:         " +surfer[' age ')

Run results

Python 3.4.3 (v3.4.3:9b73f1c3e601, Feb, 22:43:06) [MSC v.1600 + bit (Intel)] on Win32type "copyright", "credits" or "license ()" For more information.>>> ================================ RESTART =========================== =====>>> Enter The ID of the surrfer:101id:          101Name:        Johnny ' Wave-boy ' jonescountry:     usaaverage:< C3/>8.32board type:  fishage:         

Database

Import Sqlite3def find_details (id2find):    db=sqlite3.connect ("Surfersdb.sdb")    Db.row_factory=sqlite3.row    cursor=db.cursor ()    cursor.execute ("SELECT * from surfers")    Rows=cursor.fetchall () as    row in rows:        if row[' id ']==id2find:            s={}            s[' id ']=str (row[' id ') s['            name ']=row[' name ']            s[' country ']=row [' Country ']            s[' Average ']=str (row[' average '])            s[' board ']=row[' board ']            s[' age ']=str (row[' age ') Cursor.close            ( )            return (s)        cursor.close ()        return ({}) Lookup_id=int (Input ("Enter the ID of the Surrfer:")) Surfer=find _details (lookup_id) if surfer: Print    ("ID:          " +surfer[' id ')    print ("Name:        " +surfer[' name ') Print (    "Country:"     +surfer[' country ')    print ("Average:     " +surfer[' Average '])    print (" Board type:  "+surfer[' Board ')"    print ("Age:         " +surfer[' age ')

Summarize:

{}: An empty hash

S.keys () provides a list that contains all the keywords in the hash named "s".

S.ITMS () provides a list that contains all the keywords and values in the hash named "s".

Line.split (",") splits the string contained in the variable "line" at each comma occurrence.

Sorted () A built-in function that can sort many data structures.

Array: A variable that has a number of indexed slots that can hold data.

Linked list: A variable in which the data forms a chain, a data item on the chain points to another data item, the pointed data item then points to the next data item, and so on.

Queue: A variable that allows data to enter from one end of the collection, leaving from the other, and supporting a FIFO mechanism.

Hash: A variable that contains two columns and (possibly) multiple rows of data.

Collection: A variable that contains a collection of independent data items.

Multidimensional arrays: A variable that can contain data with a multidimensional matrix (but the most frequently used dimension is only 2)

Hashes and databases