dfw zip code map

Several important python functions (lambda, filter, reduce, map, zip) and pythonlambda 1. Anonymous function lambda Lambda argument1, argument2,... argumentN: expression using arguments 1. lambda is an expression rather than a statement. Because of this, lambda can appear where def is not allowed in python syntax-for example, in a list constant or in a function call parameter, as an expression, lambda retu

map using (multiple seq)Python 1 PrintMap(LambdaX,Y:X *y,[1 2,],[4,5,6 ]) # [4, ten,] The above is a case where the return value is a value, and it can actually be a tuple. The following code does not only implement multiplication, it also implements addition, and puts the product and sum in a single tuple.Python-Functional programming

, 1), (2, 2), (3, 3)] >>> d=zip (a,b) >>> list (Zip (*d)) [(1, 2, 3), (4, 5, 6)] The list (Zip ()) can only be invoked once, otherwise it returns []. To view the source code for the Python3 Supply zip (), zip () is actually a ge

http://blog.csdn.net/yongh701/article/details/50283689In Python's numpy, the transpose of a two-dimensional array similar to array=[[1,2,3],[4,5,6],[7,8,9]], is a sentence array. T. In fact, no use of numpy, the simple use of Python, the code is not long, is also a line. Before this, however, the use of the map function and the zip (*) in Python are explained fir

Python has many functional programming methods. This article describes the most common functions.Note: This article is based on python2.7. different versions may cause differences.Zip-fundingStandard format zip (seq [, seq [, seq])Example:A = (I for I in range (3 ))B = [4, 5, 6]C = (7, 8, 9)Abc = zip (a, B, c)The result of abc is [(0, 4, 7), (1, 5, 8), (2, 6, 9)]Therefore, the role of the

Python is a very concise, elegant language, many of its built-in functions combined, you can use a small number of code to achieve a lot of complex functions, if the same function to let C/c++/java to implement, it may be a big head, in fact, Python is a complex data structure hidden in the built-in functions , in C, so just write your own business logic Python will automatically come up with the results you want. The built-in functions in this area a

(multiple seq)Python 1 Print Map( Lambda X, Y: X * y, [1, 2, 3], [4, 5, 6] ) # [4, ten,] The above is a case where the return value is a value, and it can actually be a tuple. The following code does not only implement multiplication, it also implements addition, and puts the product and sum in a single tuple.Python-Functional programming

Today, when we look at Natural language processing this book, is attracted by the concept of high-level function here, because I think all functions are just functions, is to achieve a specific function of the implementation, there should be no high-level, low-grade AH! However, after understanding, found that these functions are really a bit advanced, very useful, so here to do a simple summary.1. Haskell: Previously thought it was a function, in fact it is a collectively. The functions in Hask

Sometimes it's not perfect. Some people may have saved some files, but he has changed the extension so that it is within our file type. The actual access is not displayed (because the extension does not match the contents of the file). Here's a PHP class that might be helpful. first, the PHP test classFirst of all, the above file header and file type mapping relationship from the Internet, if you have a new file need to check, just need to add the map