The Queue module implements multi-producer, multi-consumer queues. It is especially useful in threaded programming when information must be exchanged safely between multiple threads. The Queue class in this module implements all the required
文章目錄 Welcome to Deep Learning支援向量機系列探索 Python、機器學習和 NLTK 庫 8、http://deeplearning.net/Welcome to Deep Learning7、http://blog.csdn.net/zshtang/article/category/870505SVD和LSI教程6、http://blog.csdn.net/shikai1030/article/details/
import getoptimport sysdef usage(): print(''' this is help message -h --help show help info -i --input the input file or directory -g --grep grep words -t --time modify time -v --verbose show verbose information ''') passdef main(): try:
1. ifThere can be zero or more elif parts, and the else part is optional. The keyword ‘elif‘ is short for ‘else if’2. for>>> for x in a:... print(x, len(x))>>> for x in a[:]: # make a slice copy of the entire list... if
python3.1似乎和以前的2.X版本不同了。至少 print ‘hello world’被認為是語法錯誤,而要寫成函數形式—— print(“hello world”)1. Comments in Python start with the hash character, #, and extend to the end of the physical line. A hash character within a string literal is just a hash
1. defining modulesA module is a file containing Python definitions and statements. The file name is the module name with the suffix .py appended. Within a module, the module’s name (as a string) is available as the value of the global variable
Python支援資料類型:整數,浮點數,複數,字串 複數在這裡虛數由一個 "j"尾碼表示,也可以通過complex(real, img)來建立。實部和虛部可以分別訪問。就像這樣:Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->>>> c = complex(5,3)>>> c.real5.0>&
1 函數的預設值為mutable類型時的問題和解決辦法Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->def f2(a, L=[]): L.append(a) return Lprint(f2(1))print(f2(2))print(f2(3))def f3(a, L=None): if L is None: L