1:檔案內容格式為json的資料如何解析
import json,os,sys current_dir=os.path.abspath(".") filename=[file for file in os.listdir(current_dir) if ".txt" in file]#得到当前目录中,后缀为.txt的数据文件 fn=filename[0] if len(filename)==1 else "" #从list中取出第一个文件名 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 random from collections import Counter fruits=[random.choice(["apple","cherry","orange","pear","watermelon","banana"]) for i in range(20)] print(fruits) #查看所有水果出现的次数 cover_fruits=Counter(fruits) for fruit,times in cover_fruits.most_common(3): print(fruit,times) ########运行结果如下:apple在fruits里出了5次 apple 5 banana 4 pear 4
3:重新載入module的方法py3
import importlib import.reload(modulename)
4:pylab中包含了哪些modlab *
等效於下面的導入語句:
from pylab import * from numpy import * from scipy import * import matplotlib