Examples of learning Python 2

First, based on the input of all subjects whether the target student achievement statistics

1 (background: Enter the number of students, as well as individual students' language, mathematics, English, history score four subjects, and if the total score is less than 240 , the result of non-compliance, otherwise qualified success)
 2  
3  # Coding = UTF-8 
4 the n-= int (the iNPUT ( ' Please enter the number of student: ' )) # enter the number of students, and converted to an integer
 5  Print ( ' - ' * 50 ) # print the dividing line
 6 Subjects = ( ' language ' , ' mathematics ' , ' English ' , ' history ' ) # create disciplines tuple
 7 the Data ={#} Create Data Dictionary, for storing student name + score
 . 8  for i in Range (. 1,. 1 n-+ ): # student input element number i of the recording, the control cycles
 . 9      name = INPUT ( ' Please enter {} students name: ' .format (i)) # define a variable name, the name of the student receives an input
 10      i + # =. 1 student each input element i is incremented. 1
 . 11      Marks = [] # creating list Marks, each student records the four subjects scores
 12      for x in subjects: # element x traverse disciplinary record
 13          marks.append (int (the INPUT ( 'Enter the results {}: ' .format (X)))) # receiving input results, converted to an integer, and marks added to the list of
 14          data [name] = marks # added to the dictionary data of the present cycle and name Marks
 15      Print () new line #
 16  Print ( ' - ' * 50 ) dividing a print line #
 . 17  for X, Y in data.items (): # traversing the dictionary data
 18 is      Print (X, Y) traverse the dictionary contents Print #
 19      total =sum (y) # define variables total, using the sum () of the total score is calculated for each student
 20 is      Print ( ' {}} total score {, ' .format (X, Total), End = '' ) Print # Student total score of
 21 is      IF total <240 : If the total score is less than # 240, the student performance is not up to
 22 is          Print ( ' {} substandard results ' .format (X))
 23 is      the else : # otherwise qualified success
 24          Print ( ' {} the results qualified ' .format (the X-))                      


the results:  

Knowledge points:

• # Tuple tuple number comma separated values. Tuples are immutable, this does not remove or add or edit any value in a tuple.

• A dictionary is unordered dictionary # key-value pairs ( key:value) set of keys within the same dictionary must be different from each other. Use a pair of braces {}creates an empty dictionary. Can be used del keywords to delete

  Any given key-value pairs, such as del data [ 'John Doe']; to traverse a dictionary, a dictionary of the items() method, as embodied examples.

• List # list enclosed within brackets beginning of the end, you can store different data types of variable data structures. As a = [1,2.2, 'Hello' , True, [1,2,3]]. List of related methods: append (), end of the list as the additive element; INSERT (), the data is inserted to a position of the list, such as insert (2,1), 2 table index i.e. additive elements 1 position; COUNT () , the number of elements in the list of queries, such as count (1); remove () , the list of elements removed; reverse (), reversing the entire list, such as a = [1,2,3], after inversion becomes a = [3,2,1]; extend ( ), a list of all the elements of the list to the end of another, such as a = [1,2], b = [3,4], a.extend (b ), then a = [1,2,3,4]; sort ( ), to sort the list of elements, provided that the list element may be compared; del keywords, using del a [-1] to delete the list of elements, exemplified deleted elements of a list at the end.