python iterate through list

SliceA slice is a partial element that gets a list, a tuple, a string, and so on1L = Range (100) 2 #take [0,5] element3 Print(L[:5])#[0, 1, 2, 3, 4]4 #in [0,99], take one of every 10 elements5 Print(L[::10])#[0, ten , +, +, +,--6 #take the last five elements7 Print(l[-5:])#[98, ©8 9str ="www.genekang.com" Ten #can also be used to intercept strings One Print(Str[4:8])#GeneIteration If given a list or tuple,

inside the parser, rather than in manual Python code, especially for larger data sets, This is one of the main performance benefits of using list parsing. Traverse1. Iterating through the method of sequence fetching elements #!/usr/bin/python2.5for i in ' hello ': #序列里的字符串 print i, y = [1,2,3,4,5,6] #列表for i in Y: print I, H e l l o 1 2 3 4 5 6 2. Traverse by the method of the sequence itself to

Scala list/sequence faq:how do I iterate over a Scala List (or more generally, a sequence) using the foreach method or for loop?There is a number of ways to iterate over a Scala List using the foreach method (which was available to Scala sequences like ,,,,

Use the list () method to get the query results, each time a query statement, get all the data using the iterate () method to get the results of the query, first issued an SQL statement to query the ID that satisfies the condition data, and then to query the records by these IDs, that is, to execute the n+1-bar SQL statement (N Number of records that match the criteria) Sessionfactory = new Configuration ()

For the list method, hibernate actually gets all the records through a select SQL. and read it out and fill it back in the Pojo.The iterate method is to first get all the IDs of the records that meet the query criteria through a select SQL, and then loop through the collection of IDs, taking the records corresponding to each ID in a separate select SQL, and then filling in the Pojo to return.That is, a SQL

List = ['HTML','JS','CSS','python']#Method 1#Traversal List Method 1: ' forIinchlist:Print("ordinal:%s Value:%s"% (List.index (i) + 1, i))#Traversal List Method 2: '#Method 2 forIinchRange (len (list)):Print("ordinal:%s Value:%s"% (i + 1),

list and iterate methods for the 1.Query interface: Iterate () Method: Return the query results as an Iterator. Ifthe query contains multiple results pre row, the results is returned in Aninstance ofobject[].Entities returned as results is initialized OnDemand. The first SQL query returns identifiers only. (The returned entity is initialized only when it is used,

There are two ways to execute a HQL query, one is the list method and the other is the iterate method. What's the difference between the two methods, let's illustrate the difference by example.Company table:650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M01/7C/A6/wKioL1bVHaPArE8EAAAN7mNGBzQ433.png "title=" 1.PNG " alt= "Wkiol1bvhapare8eaaan7mngbzq433.png" style= "float:none;"/>Employee table (employ

1. Use the list () method to get the results of the query, issuing a statement each time to get all the data.2. Use the iterate () method to get the results of the query, first issue an SQL statement to query the ID that satisfies the condition data, and then follow these IDs to query the records, that is, to execute the N+1 SQL statement (n is the number of records that match the criteria)Two execution of

Both list () and iterate () can be used to obtain the HQL results obtained by query.The list () uses an instant load. The query will be preceded by a database query hql and all results present in the cache.Iterate () uses a delay load. Queries will only have the OID of the object in the cache, when needed, if only the OID, directly in the cache to fetch, if you n

right side of the function, the right can only write an array//only for the index array//to map each element of the right array to the left variable$arra=Array(1,2,3,4,5,6);List($a,$b,$c,$d,$e,$f)=$arra;Echo $a; Echo";//list ($a, $b, $d, $e, $f) = $arra, or//while loops, each (), list () iterates through the array while(List