1:文件內容格式為json的數據如何解析

import json,os,syscurrent_dir=os.path.abspath(".")filename=[file for file in os.listdir(current_dir) if ".txt" in file]#得到當前目錄中，后綴為.txt的數據文件fn=filename[0] if len(filename)==1 else "" #從list中取出第一個文件名if fn: # means we got a valid filename  fd=open(fn)  content=[json.loads(line) for line in fd]  else:  print("no txt file in current directory")  sys.exit(1)for linedict in content:  for key,value in linedict.items():    print(key,value)  print("/n")

2：出現頻率統計

import randomfrom collections import Counterfruits=[random.choice(["apple","cherry","orange","pear","watermelon","banana"]) for i in range(20)]print(fruits) #查看所有水果出現的次數cover_fruits=Counter(fruits)for fruit,times in cover_fruits.most_common(3):  print(fruit,times)########運行結果如下：apple在fruits里出了5次apple 5  banana 4pear 4

3:重新加載module的方法py3

import importlibimport.reload(modulename)

4:pylab中包含了哪些module

   from pylab import *


等效于下面的導入語句：

  from pylab import *  from numpy import *  from scipy import *  import matplotlib