Python 基本使用

遍历存元组的列表进行操作

一堆xy坐标，找出x，y的左上角与右下角

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max_t = reduce(lambda x,y: (max(x[0],y[0]),max(x[1], y[1])),l)

p; min_t = reduce(lambda x,y: (min(x[0],y[0]),min(x[1], y[1])),l)

用zipfile写压缩包

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f = zipfile.ZipFile("testzip.zip","w",zipfile.ZIP_DEFLATED)

f.write("e:/a/1.max","1.max");

f.write("e:/a/2.max","2.max");

f.close()

print "over"

往sqlite3写入blob类型的数据

blob对应于python的buffer，具体看例子：

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#coding:utf8

import sqlite3

create_sql = "create table if not exists test_blob('id' integer primary key AUTOINCREMENT, 'b' BLOB);"

db = sqlite3.connect("test.db")

cur = db.cursor()

cur.execute(create_sql)

#写二进制文件

f = open("CE6.jpg","rb")

data = f.read()

f.close()

cur.execute("insert into test_blob('b') values(?)",(buffer(data),))#使用buffer,跟sqlite3.Binary()效果一样

db.commit()

#读文件

cur.execute("select b from test_blob")

b = cur.fetchone()[0]

with open('test2.jpg','wb') as f:

f.write(b)

db.commit()

db.close()

获取随机字符串：

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"".join(random.sample('abcdefghijklmnopqrstuvwxyz',10))

复制文件夹，

以前喜欢自己写，才发现有现成的

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shutil.copytree("1234","new_1234")

获取随机的uuid

没有什么技巧

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uuid.uuid4()