ipython

启动

set LANG=zh_CN.UTF-8 && jupyter notebook --notebook-dir=d:\jupyter\ --ip='*' --NotebookApp.token='' --NotebookApp.password=''

Latex

$x$

from IPython.display import Latex
Latex('$x$')

\(x\)

解方程

import sympy
x=sympy.Symbol('x')
fx=5*x+4
result=fx.evalf(subs={x:6})

x=sympy.Symbol('x')
y=sympy.Symbol('y')
fx=x*x+y*y
result=fx.evalf(subs={x:3,y:4})

x=sympy.Symbol('x')
y=sympy.Symbol('y')
fx=x*3+9
result=sympy.solve(fx,x)

x=sympy.Symbol('x')
y=sympy.Symbol('y')
fx=x*3+y**2
result=sympy.solve(fx,x,y)

x=sympy.Symbol('x')
y=sympy.Symbol('y')
f1=x+y-3
f2=x-y+5
result=sympy.solve([f1,f2],[x,y])

from IPython.display import Latex
a=sympy.Symbol('a')
b=sympy.Symbol('b')
x=sympy.Symbol('x')
y=sympy.Symbol('y')
#simplify( )普通的化简
sympy.simplify((x**3 + x**2 - x - 1)/(x**2 + 2*x + 1))
sympy.latex(((x**3 + x**2 - x - 1)/(x**2 + 2*x + 1)))
# #trigsimp( )三角化简
sympy.trigsimp(sympy.sin(x)/sympy.cos(x))
sympy.latex(sympy.sin(x)/sympy.cos(x))
# #powsimp( )指数化简
sympy.powsimp(x**a*x**b)
sympy.latex(x**a*x**b)

\(\frac{x^{3} + x^{2} - x - 1}{x^{2} + 2 x + 1} \Rightarrow x-1\)

\(\frac{\sin{\left(x \right)}}{\cos{\left(x \right)}} \Rightarrow \tan{\left(x \right)}\)

\(x^{a} x^{b} \Rightarrow x^{a + b}\)

Hive parquet to csv

import os
from pathlib import Path

def file_name(file_dir):
    for root, dirs, files in os.walk(file_dir):
        for file in files:
            if os.path.splitext(file)[-1] == '.parquet':
                my_file = Path(os.path.join(root, file+".csv"))
                if my_file.is_file()==False:
                    df=pd.read_parquet(os.path.join(root, file))
                    df.to_csv(os.path.join(root, file+".csv"))
    return

file_name("data/")

迭代运行命令Shell Command line

a=["c","d"]
cc=['']
for b in a:
    tmp="{}:\\".format(b)
    dd=! dir {tmp}
    while dd.__class__.__name__!="SList":
        import time
        time.sleep(0.001)
    cc=cc+dd
print('\r\n'.join(cc))