Python 常用包
阿新 • • 發佈:2019-02-19
包名 | 說明 |
---|---|
NLTK | 自然語言包 |
NumPy | 科學計算庫,支援多維陣列和線性代數,在某些計算概率、標記、聚類和分類任務中使用 |
Matplotlib | 資料視覺化的 2D 繪相簿 |
import sys
for dir in sys.path:
print(dir)
import os
current_dir = os.getcwd();
os.makedir('dir');
os.listdir('.')
stats = os.stat('new.txt');
from datetime imoort datetime
datetime.from(stats.st_atime)
impot json
f = open('city.json','rw')
cities = json.load (f)
json.dump(cities,f,indent=2)
f.close
import sqlite3
conn = sqlite3.connect('test.db')
cursor = conn.cursor()
sql = 'create table students(id int,name text,username text)'
cursor.execute(sql)
insert_sql = 'insert into students(id,name,username) values(:id,:name,:username)'
cursor.execute(sql,'id' :1,'name':'Tom','username':'NickName')
conn.commit()
select_sql = 'select * from students'
results = cursor.execute(sql)
students = results.fetchall()
cursor.close()