nested while loops python

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Initial knowledge of Python (conditional judgment, loop control, cycle limit, common data types, string formatting, list common operations, binary operations, nested loops)

the current cursor position in the file ##文件的光标的移动# obj.seek (0) #光标回到文件最开始处, the second argument can not be written, the default is the start of a file 0# Obj.seek (0,0) #光标回到文件最开始处Obj.seek (12,0) #光标回到以文件0开始, 12th characterPrint Obj.tell ()Obj.seek (6,1) #光标从当前位置1开始, 6th characterPrint Obj.tell ()Obj.seek (3,2) #光标从文件最后2开始, 3rd characterPrint Obj.tell () #0 displays the current position of the cursor, which is the No. 0 character# Seek Summary# second argument, 0 for file start, 1 for file cu

Python practice-block-nested loops

For multiplier in range (5,8): For I in Range (1,11): Print I, "x", multiplier, "=", i*multiplier print#I tried to align the 2nd for with the first for, but the program gave an error.I understand that if Lacy, it will represent the second block as a separate block to run, so the print calculation will not be able to get the value of Multplier, so the calculation can not be completed#resultc:\python27\python.exec:/users/hunk/pycharmprojects/untitled/guess-number.py1x5= 52x5=103x5=154x5=205x5 =256

Data nested loops in thinkphp and thinkphp nested loops

Data nested loops in thinkphp and thinkphp nested loops During thinkphp, nested loops are used in the loop, and the second loop is associated with the outside. The thinkphp official website provides the following documents: The t

thinkphp data nesting loops, thinkphp nested loops _php Tutorials

thinkphp data nesting loops, thinkphp nested loops When doing thinkphp, it is necessary to use loops inside the loop, and the second loop is associated with the outside. The documents given by the thinkphp website are: " list " id= " vo "> " vo[' Sub

Join the normal table three algorithms (join one) nested loop join (Nested Loops join), sort Merge Join (Sort-merge join), and hash join (hash join) _hadoop

Refer to http://mysun.iteye.com/blog/1748473 one of the join series through Map-reduce The opening of this series begins with a look at the more extensive and popular central join algorithms currently in use in the database before you mention using Map-reduce to implement joins. They are nested loops join (Nested Loops

How to implement nested loops of data by category in Thinkphp. thinkphp nested _ PHP Tutorial

In Thinkphp, data is nested by classification and nested by thinkphp. In Thinkphp, data is nested by category. thinkphp nesting this article describes how to implement data nested by category in Thinkphp. Share it with you for your reference. The implementation method of data neste

MySQL block Nested Loop and batched key access Joins (block nested loops and bulk Key access connections)

produced by the previous join operation (and only the columns of interest), and the incremental join Some data rows in buffer refer to the same row of data stored in the previous join buffer (match success); The incremental join buffer guarantees the small frequency of the copy data from the previous join buffer, which saves space in the join buffer, because in general, the rows produced by the previous join operation may be matched by the multiline data of the joined table of the join operatio

Implementation of nested loops of data by category in Thinkphp and nested in thinkphp

Implementation of nested loops of data by category in Thinkphp and nested in thinkphp This article describes how to implement a nested loop of data in Thinkphp by category. Share it with you for your reference. The specific implementation method is as follows: During thinkphp, nest

Identification of external and internal tables connected by nested oracle Loops

Identification of external and internal tables connected by nested oracle Loops SQL> create table a1 as select * from all_objects ; Table created SQL> select count(*) from a1; COUNT(*) ---------- 49708 SQL> create table a2 as select * from a1 where rownum Table created SQL> analyze table a1 computer statistics; SQL> analyze table a2 computer statistics; 1 nested

Sixth--Optimizing performance according to execution plan (1)--understanding hashing, merging, nested loops join policies

Preface: This series of articles includes: 1, understand the hash, Merge, Nested Loop Association strategy. 2. Find and resolve table/index scans in the execution plan. 3. Introduce and find keys to find and resolve them in the execution plan. For performance optimization, the following issues need to be centrally addressed: 1, create a performance baseline for your environment. 2, monitor the current performance and find bottlenecks. 3, solve the b

Nested Loops,hash join, Sort Merge join

In a multi-table federated query, if we look at its execution plan, we'll see how many tables are connected. There are three ways to connect between multiple tables: Nested Loops,hash Join and Sort Merge join. What type of connection to use depends on Current optimizer mode (All_rows and RULE) Depends on table size Depends on whether the connection column has an index Depends on whether

C-language dummies (1): nested loops-program structure, dummies

C-language dummies (1): nested loops-program structure, dummies Loop statement nesting a loop structure can contain another loop, called loop nesting, or multiple loops. The nested loop is a double loop. The outer loop is called an external loop, and the inner loop is called an internal loop. --------- I don't know whe

To explain the nested use of C + + do While loops and loop statements _c language

after the while, should include statements (such as i++, or i=i+1, etc.) that tend to end the loop in the loop body. The For loop can include an operation that tends to end the loop in Expression 3, and even put all the operations in the loop body into expression 3. The For statement is therefore more powerful and can be implemented with a for loop where the while loop can be done. 3 when using while and do-while loops, the operation of the loop va

Optimization of Nested Loops

Requirements backgroundToday we have a requirement: Map A and map B, all two maps hold a similar key--id, and their corresponding value may or may not be the same. It is now necessary to do something special with the same key value pair as the key corresponding to the value in the two map.This is a very simple need, the code is very simple, I directly in a loop nested another loop to achieve this function requirements:for(Map.EntryWrite the time also

Nested loops in Oracle jump out of the internal loop body instance

execute the next outer loop i=11.⑥ ... Wait a minute. You can think about what I would do to make the inner loop jump ahead of time? Yes, it's smart, when I'm a divisor of 500, the inner loop produces a result equal to 500, so it jumps out of the loop ahead of time. Similarly, when i*j=1000 out of the outer loop, that is, the whole cycle. The earliest occurrence should be i=10,j=100, but i=10 time, wait for J to take to 100 of the time result will fetch (I=10,J=50), so this is pass away.This

Nested Loops of Java learning

Learn to program Java learning nested loop released, welcome to visit through Xuebiancheng8.comThe Java nested loops are mainly referred to in while,do...while, and for loops can be nested in each other, for example, in the while loop can nest Do...while

Nested Loops of Java learning

Learn to program Java learning nested loop released, welcome to visit through Xuebiancheng8.comThe Java nested loops are mainly referred to in while,do...while, and for loops can be nested in each other, for example, in the while loop can nest Do...while

Implementation of nested loops of data by category in Thinkphp

This article mainly introduces how to implement data nested loops by category in Thinkphp. it is applicable to nested loops with relevance and is a practical technique. For more information, see ThinkPHP. This article describes how to implement a nested loop of data in Thi

ThinkPHP learning (4) multiple nested loops of advanced volist labels

ThinkPHP learning (4) volist tag multiple nested loop Action code for advanced applications: publicfunctionindex () {$ prodI ( quot; get. prod_en quot;); $ idI ( quot; get. id quot;, 0, quot; int quot;); if ($ prod quot; ThinkPHP learning (4) multiple nested loops of advanced volist labels Action code: Public function index () {$ prod = I ("get. prod_en "

How to Use nested loops in Lua Programming

How to Use nested loops in Lua Programming This article describes how to use nested loops in Lua programming. It is the basic knowledge of Lua beginners. For more information, see The Lua programming language allows one loop to embed another loop. The following describes several examples to illustrate this concept. Sy

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