python基础

标签：python

1.打印hello world

#coding:gbk

def main():
	print("hello world")

if __name__ == '__main__':
	main()

#coding:gbk
def calc(n):
	total = 0
	for i in range(n):
		total += i
	return total

def calc_1(n):
	total = 0
	i = 0
	while i <= 100:
		total += i;
		i += 1
	return total

def calc_2(n):
	total = 0
	for i in xrange(0, n):
		total += i
	return total

if __name__ == '__main__':
	total = calc(100)
	print(total)
	total1 = calc_1(100)
	print(total)
	total2 = calc_2(100)
	print(total)

#coding:gbk

def file_cat(f_name):
	fd = open(f_name, "rb+")
	for l in fd.readlines():
		print(l)
	fd.close()
		
def file_cat_1(f_name):
	fd = open(f_name, "rb+")
	buf = fd.read();
	if buf != None and len(buf) > 0:
		print(buf)
	fd.close()

def file_wite(f_name):
	fd = open(f_name, "wb+")
	fd.write("hello world\n")
	fd.write("heihei")
	fd.close()

if __name__ == '__main__':
	f_name = "tmp"
	file_wite(f_name)
	file_cat(f_name)
	file_cat_1(f_name)

#coding:gbk
import os
import commands

def do_cmd(cmd_str):
	return os.system(cmd_str)

def do_cmd_1(cmd_str):
	return os.popen(cmd_str).read()

def do_cmd_2(cmd_str):
	return commands.getstatusoutput(cmd_str)

if __name__ == '__main__':
	ret = do_cmd("ls -l")
	res = do_cmd_1("ls -l")
	ret, res = do_cmd_2("ls -l")
	print(ret)
	print(res)
	print("ret = %d, res = %s"%(ret, res))

5.线程操作

#coding:gbk

import threading

class MyThread(threading.Thread):
	"""docstring for MyThread"""
	def __init__(self, i, n):
		threading.Thread.__init__(self)
		self.index = i
		self.n = n

	def run(self):
		total = 0
		for i in xrange(1, self.n):
			total += i
		print("%d thread calc %d from 1 total is %d\n"%(self.index, self.n, total))

if __name__ == '__main__':
	n = 10
	init_n = 100
	ths = []
	for x in xrange(1, n):
		th = MyThread(x, init_n)
		init_n += 500
		ths.append(th)

	for th in ths:
		th.start()

	for th in ths:
		th.join()

<pre name="code" class="python">#coding:gbk

def map_process():
	maps = {"1":"bb", "2":"cc", "3":"dd"}
	maps["4"] = "44"
	for k in maps.keys():
		print("key:%s, value:%s"%(k, maps[k]))

def vec_process():
	vec = ["a", "b", "c", "d"]
	vec.append("e")
	vec.append("f")
	vec.remove("b")
	for str in vec:
		print(str)

def str_process():
	str_test = "hello world"
	print("str:%s, len:%d"%(str_test, len(str_test)))
	str_test = "123"
	n = int(str_test)
	n += 1
	print("str_test:%s, n:%d, str(n):%s"%(str_test, n, str(n)))

if __name__ == '__main__':
	map_process()
	print("++++++++++++++++++++++++++++")
	vec_process()
	print("++++++++++++++++++++++++++++")
	str_process()

7.正则表达式操作

#coding:gbk

import re

def regex_match(regex_str, pat_str):
	return re.match(regex_str, pat_str) != None

def regex_search(regex_str, pat_str):
	return re.search(regex_str, pat_str)

def regex_search_all(regex_str, pat_str):
	return re.findall(regex_str, pat_str)

def regex_test():
	regex_str = r"ab+"
	regex_search_str = r"bc"
	pat_str = "abbcbbc"
	res = regex_match(regex_str, pat_str)
	print("res = %d"%res)
	res_obj = regex_search(regex_search_str, pat_str)
	if res_obj != None:
		print("search %s"%(res_obj.group()))
	else:
		print("can not search")
	res_obj = regex_search_all(regex_search_str, pat_str)
	if res_obj != None:
		print "search ",res_obj
	else:
		print("can not search")

if __name__ == '__main__':
	regex_test()

python基础

标签：python

原文地址：http://blog.csdn.net/zqm175899960/article/details/45196659