erd generator

__next__() methodsNote: For an iterator object, the __iter__ method is executed, and the result is still itself 5. Advantages and disadvantages of iterators Advantages:1. Provides an iterative approach that does not rely on subscript2. More memory savings on the drop iterator itselfDisadvantages:1. Unable to get the length of the iterator object2. The value of the sequence type is flexible, is a one-time, can only be taken back to the value, not forwardSecond,

http://www.cnblogs.com/qixiaoyizhan/p/7597315.html "Preface"Using Mybatis-generator to automatically generate DAO, Model, mapping related files, the role of Mybatis-generator is to act as a code generator, and using code generators not only simplifies our workload, Productivity is improved, and the probability of code errors can be greatly reduced. In the SSM (Sp

: ret.append (expr)Example: for inch if and i%3==for ifif i%3==0]the use of a list-resolved multilayer loop:A list of analytic expressions:[Expr for I in Iterable1 for J in Iterable2]Natural notation:ret = [] for in iterable1: for in iterable2: Ret.append (expr)Example[(x, Y) forXinch 'ABCDE' forYinchRange (3)][[x, y] forXinch 'ABCDE' forYinchRange (3)][{x:y} forXinch 'ABCDE' forYinchRange (3)]Generator e

1. Generator functionsThe difference between a generator function and a normal function is that1. Use yield instead of return in the generator function, and yield can be called multiple times2. When the function runs to yield, the yield current state is preserved, waiting for the next nextUsage examples:　　def Test (): yield 1 yield 2 yield 3a=test () b=

List Builder is a very simple but very powerful built-in python.Generate a list [1,2,3,4] can use list (range (1,5))Application of List BuilderIf the above formula is judged, you can filter out the desired result, such as just the square of the even numberUsing multi-layer loopsGeneratorThe essential difference between a generator and a list generator is that one has generated data, and when used, it genera

Js-generator Foundation (Fourth week)Read a few hours generator related articles, found that there are too many things, this week want to give up writing this, transliteration other aspects of the last time with this trick, but did not find other writable, and finally decided to write a fairly basic generatorWhat is generator?

List-generated--A list can be generated quickly , and another listcan be deduced from a list , and the code is simple:>>> [x * x for x in range (1, 11)][1, 4, 9, 16, 25, 36, 49, 64, 81, 100]>>> [x * x for x in range (1, one) if x% 2 = = 0][4, 16, 36, 64, 100]>>> [m + N for M in ' ABC ' for n in ' XYZ '][' AX ', ' AY ', ' AZ ', ' BX ', ' by ', ' BZ ', ' CX ', ' CY ', ' CZ ']Generator (Generator)--wit

Get started and transition to PHP7 -- lightweight "set" iterator-Generator lightweight "set" iterator-Generator Boxue video link URL Generator is a new language feature added to PHP 5.5. However, it does not seem to be widely used by many PHP developers. Therefore, before learning about the improvements made by PHP 7 to Gener