1:文件内容格式为json的数据如何解析
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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")
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2：出现频率统计
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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
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3:重新加载module的方法py3
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import importlib
import.reload(modulename)
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4:pylab中包含了哪些module
from pylab import *
等效于下面的导入语句：
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from pylab import *
from numpy import *
from scipy import *
import matplotlib
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