learn python 3 hard way review

Python 3 easy way to read and write files!A = open (' Test.txt ', ' W ')This line of code creates a text document named Test, the pattern is write (the pattern is divided into three types, W stands for writing, R is for reading, and a for the tail line is added).A.write (' hello,world! ')This line of code is to write data to the Test.txt file, which is written in

Recently learning Python in the system is based on a set of Python3 courses Mooc above. This paper mainly summarizes the key points of the basic part. 1.python Basic data types 2.python operator 3. Build a simple and efficient IDE environment 4. Packages, modules, classes, functions, variables 1.

to small), bool type, default value Falsereturn: NoneDescription of the sort function:Entry: The elements in the list, filled in, followed by only one element at a time, so the function must be allowed to only fill in one parameterReturn: Sort by the elements of a number, string equivalent type, sort arranges the newly created elements again, arranges the original elements of their mapping, and if multiple values are returned, the first return value is the highest priority, the second is the se

, in which case a sequence of tuples is generated with the elements in the sequence parameter. Here's an example of using the map () function:Def Add_one (a): return a + 1def add_two (A, B): return a + bdef add_three (A, B, c): return a + b + ca = [1, 2, 3, 4, 5]b = [1, 2, 3, 4, 5]c = [1, 2, 3, 4, 5]result = Map (Add_one, a) print Resultresult = Map (Add

that can receive a key function to implement a custom sort, sort the keys, and then display the corresponding value sort results.A reverse sort can pass in the third parameter reverse = True.return function: function can return a result of a calculation, or return a function, return a function, this function is not executed, so it is best not to refer to variables that may changeanonymous function: Lambda x:x*x where x is the parameter of the function, the result of the expression of the anonym