create table <TABLE_NAME>( <KEY1> <DATA_TYPE>[(<LENGTH>) <CONSTRAINT>], ... ); # 中括号的内容可以不写 写入数据的方式 增加一组数据 insert into <TABLE_NAME> values( <VALUE1>, ... ); 只增加某关键字下的数据 insert into <TABLE_NAME> (<KEY1>,...) values (<VALUE1>,...)...
1、加载datatable、查看版本号 import datatable as dt dt.__version__ 2、三种方式创建datatable.Frame import pandas as pd import numpy as np import datatable as dt # Inputs my_list = list('abcedfghijklmnopqrstuvwxyz') my_arr = np.arange(26) my_df = pd.DataFrame(dict(col1=my_list, ...
>>> float("4.5") >>> int("25") >>> int(5.625) >>> float(6) >>> int(True) >>> float(False) >>> str(True) >>> bool(0) >>> bool('Hello world') >>> bool(223.5) CopyOutput:4.5 25 5 6.0 1 0.0 'True' False True True Tuples...
today=dt.datetime.today().strftime("%Y-%m-%d")# 连接mysql数据库 engine=create_engine('mysql+pymysql://root:123456@localhost/my_database?charset=utf8'
You can also specify text alignment using the greater than operator:>. For example, the expression{:>3.2f}would align the text three spaces to the right, as well as specify a float number with two decimal places. Conclusion In this article, I included an extensive guide of string data ty...
create_sql负责创建表，data_sql负责导入数据create_sql='create table if not exists '+table_name+'...
microseconds =float(date_value) /10ts = datetime.datetime(1601,1,1) + datetime.timedelta( microseconds=microseconds)returnts.strftime('%Y-%m-%d %H:%M:%S.%f') 最后,我们准备将处理后的结果写入 CSV 文件。毫无疑问,这个函数与我们所有其他的 CSV 函数类似。唯一的区别是它在底层使用了unicodecsv库,尽管...
CREATE [OR REPLACE] [TEMPORARY] FUNCTION [IF NOT EXISTS] function_name ( [ function_parameter [, ...] ] ) { [ RETURNS data_type ] | RETURNS TABLE [ ( column_spec [, ...]) ] } [ characteristic [...] ] { AS dollar_quoted_string | RETURN { expression | query } } function_...
CREATE [OR REPLACE] [TEMPORARY] FUNCTION [IF NOT EXISTS] function_name ( [ function_parameter [, ...] ] ) { [ RETURNS data_type ] | RETURNS TABLE [ ( column_spec [, ...]) ] } [ characteristic [...] ] { AS dollar_quoted_string | RETURN { expression | query }...
参数width(float类型)设置列宽; 参数cell_format(Format类型)指定格式对象; 参数options(dict类型)设置行hidden(隐藏)、level(组合分级)、collapsed(折叠)。 操作示例如下: #!/usr/bin/python#---coding:-utf-8---import xlsxwriterworkbook = xlsxwriter.Workbook('demo6.xlsx') #创建一个Excel文件 worksheet =...