learning python 5th edition

associated with loops, which describe the while loop and the For loop implementation file operation. The code is as follows:#使用while循环fr =open (' Test.txt ', ' R ') Str=fr.readline () Str=str.rstrip (' \ n ') while str!= "": print str str= Fr.readline () str=str.rstrip (' \ n ') Else: print ' End while ' fr.close# uses for loop rfile=open (' Test.txt ', ' R ') for s In Rfile: s=s.rstrip (' \ n ') print sprint ' End for ' rfile.close ()where for call iterator iterator, an itera

The same is the "Basic Python Tutorial (second edition)" content, but the later content to learn, compared to the previous will be more interesting, but also more practical, so the "base" to "advanced."Python ebook sharing address: http://yunpan.cn/Q2U87uGrNiTA3This section speaks about the operation of the file-------------------------------Open FileThe Open fun

": datetime.datetime(2017, 11, 12, 11, 14)}, {"_id": 1001,"author": "Maxsu", "title": "MongoDB is fun", "text": "and pretty easy too!", "date": datetime.datetime(2019, 11, 10, 10, 45)}] posts = db.posts result = posts.insert_many(new_posts) print("Bulk Inserts Result is :", result.inserted_ids) #print (post) InquireSingle Document QueryGet a single document using Find_one () #!/usr/bin/python3 #coding=utf-8 import datetime from pymong

to facilitate (get) every character in a stringGrammar:The for variable in can iterate over the object:PassAn iterative object: an object that can take a value outwardS19 = "Hello everyone, I am vue, the front-end of the children." How you doing? "# using the While loopindex = 0While index Print (S19[index]) # using indexed tiles to complete the search of charactersindex = index + 1# for Loop, take each character in the S19 and assign it to the previous CFor C in S19:Print (c)‘‘‘In there are tw

, all the error types are inherited from BaseException , so in the use except of note that it not only captures the type of error, but also its subclasses "clean sweep"Try: foo () except StandardError, E: print ' StandardError ' except ValueError, E: print ' ValueError 'The second one except is never caught ValueError , because ValueError StandardError the subclass, if any, is also captured by the first one except .Common error types and inheritance relationships: Https://docs.python.or

and the 3rd element are calculated: F (4, 5), the result is 9; Then the result and the 4th element are calculated: F (9, 7), the result is 16; Then the result and the 5th element are calculated: F (16, 9), the result is 25; Since there are no more elements, the calculation ends and the result 25 is returned. Reduce () can also receive a 3rd optional parameter as the initial value of the calculation. If you set the initial value to 10

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