while loop [Python] 05_Python basis of

Three processes 1. Introduction program

• Order  - from top to bottom , the order of execution
• Branch  - The conditions of determination, the branch decision code
• Circulation  - make specific code is executed

2.while basic grammar

while condition (determination counter reaches the target number of times):

　　When the conditions are met, to do 1

　　When the conditions are met, do 2

　　……

　　Process conditions (counter + 1)

NOTE: while statement and the indented portion is a complete block of code

3. assignment operator

4.break 和 continue

• break when a certain condition is satisfied, the loop is exited , the code is not executed subsequently repeated
• continue when a certain condition is satisfied, no loop is exited , the code does not perform subsequent iterations

Note: BREAK and continue for the current cycle where the only valid

5. nested loop

while Condition 1:

　　1 when the condition is met, do 1

　　1 when the condition is met, do 2

　　……

　　while Condition 2:

　　　　When the condition 2 is met, do 1

　　　　When the condition 2 is met, do 2

　　　　……

　　　　Process conditions (counter + 1)

　　Process conditions (counter + 1)

6. escape character

• \ t 　　output console in a tab to assist in maintaining vertical alignment of the text when the output
• \ n 　   In the console output a newline

Escape character table:

 

7. comprehensive training multiplication table

1 row = 1
2 while row <= 9:
3     col = 1
4     while col <= row:
5         print("%d X %d = %d" % (col, row, row * col), end="\t")
6         col += 1
7     print("")
8     row += 1

 Output: