以下代码都是在工作中经常遇到,然而死记硬背下来是不可能的,每次都现查也太麻烦了;因此在这里进行整理,以便以后无数次的使用(长期更新)
获取当前可读时间
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 | import timetime.strftime("%Y-%m-%d_%H-%M-%S",time.localtime())
 
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在输出的excel中插入超链接
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 | =HYPERLINK("https://3g.k.sohu.com/t/n685055087","显示")
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读写json文件
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 | with open(path, "w", encoding="utf-8") as f:
 json.dump(resdict, f, ensure_ascii=False, indent=4)
 
 with open("file.json", encoding="utf-8") as f:
 resdict = json.load(f)
 
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使用pandas读写excel的多个sheet
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 | import pandas as pd
 writer = pd.ExcelWriter('/path/to/XXX.xlsx')
 df1.to_excel(writer, "sheet1")
 df2.to_excel(writer, "sheet2")
 df3.to_excel(writer, "sheet3")
 writer.save()
 writer.close()
 
 
 df = pd.read_excel("../path/to/XXX.xlsx", sheet_name="sheet1")
 
 
 
 dic = {"key1": list1, "key2": list2}
 DataFrame(dic).to_excel("a.xlsx")
 
 lst = [[1,2,3],["a", "b", "c"]]
 DataFrame(lst, columns=["数字", "字母"]).to_excel("a.xlsx")
 
 
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获取文件相对路径
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 | import osgetModulePath = lambda p: os.path.join(os.path.dirname(__file__), p)
 
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python操作MySQL数据库
参考资料:点我
一个不用写SQL语句,只需要填参数的工具类
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 | import pymysql
 class Database():
 
 
 def __init__(self, **config):
 try:
 
 self.__conn = pymysql.connect(**config)
 self.__cursor = self.__conn.cursor()
 except Exception as e:
 print("数据库连接失败:\n", e)
 
 
 
 def select_one(self, table_name, factor_str='', field="*"):
 if factor_str == '':
 sql = f"select {field} from {table_name}"
 else:
 sql = f"select {field} from {table_name} where {factor_str}"
 self.__cursor.execute(sql)
 return self.__cursor.fetchone()
 
 
 
 def select_many(self, num, table_name, factor_str='', field="*"):
 if factor_str == '':
 sql = f"select {field} from {table_name}"
 else:
 sql = f"select {field} from {table_name} where {factor_str}"
 self.__cursor.execute(sql)
 return self.__cursor.fetchmany(num)
 
 
 
 def select_all(self, table_name, factor_str='', field="*"):
 if factor_str == '':
 sql = f"select {field} from {table_name}"
 else:
 sql = f"select {field} from {table_name} where {factor_str}"
 self.__cursor.execute(sql)
 return self.__cursor.fetchall()
 
 
 def insert(self,table_name, value):
 sql = f"insert into {table_name} values {value}"
 try:
 self.__cursor.execute(sql)
 self.__conn.commit()
 print("插入成功")
 except Exception as e:
 print("插入失败\n", e)
 self.__conn.rollback()
 
 
 
 def update(self, table_name, val_obl,change_str):
 sql = f"update {table_name} set"
 
 
 for key, val in val_obl.items():
 sql += f" {key} = {val},"
 
 
 sql = sql[:-1]+" where "+change_str
 try:
 self.__cursor.execute(sql)
 self.__conn.commit()
 print("修改成功")
 except Exception as e:
 print("修改失败\n", e)
 self.__conn.rollback()
 
 
 def delete(self,table_name, item):
 sql = f"delete from {table_name} where {item}"
 try:
 self.__cursor.execute(sql)
 self.__conn.commit()
 print("删除成功")
 except Exception as e:
 print("删除失败\n", e)
 self.__conn.rollback()
 
 
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调用
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 | from mysql_normal_util import Database
 
 
 config = {
 "host": "127.0.0.1",
 "port": 3307,
 "database": "lebo",
 "charset": "utf8",
 "user": "root",
 "passwd": "root"
 }
 
 
 db = Database(**config)
 
 
 select_one = db.select_one("user")
 print(select_one)
 
 
 select_many = db.select_many(3, "user")
 print(select_many)
 
 
 select_all = db.select_all("user", "id>10")
 print(select_all)
 
 
 db.insert("user","(20,'111')")
 
 db.insert("user", "(21,'123'),(22,'456')")
 
 
 db.update("user", {"name": "222"}, "id=20")
 
 db.update("user", {"id": "23", "name": "12345"}, "id=103")
 
 
 db.delete("user", "id=23")
 
 
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通过shell命令导出mysql数据
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 | /usr/bin/mysql -hclientrecmtagro.db.sxhano.com -urecom_tag_ro -p4BhBsLfEMq3m -P3306 --default-character-set=utf8 -Drecom_tag -A -Ne "select * from t_term_info" > "model/sqlModel.txt”# -h后跟数据库域名
 # -u后跟用户
 # -p后跟密码
 # -D后跟数据库名称
 
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