import os
path1 = 'C:\\Users\\awake_ljw\\Documents\\python for data analysis\\test1'
path2 = 'C:\\Users\\awake_ljw\\Documents\\python for data analysis\\test2'
filelist = os.listdir(path1)
for files in filelist:
 Olddir = os.path.join(path1,files)
 filename = os.path.splitext(files)[0]
 filetype = os.path.splitext(files)[1]
 print Olddir
 file_test = open(Olddir,'r')
 Newdir = os.path.join(path2,str(filename)+'.csv')
 print Newdir
 file_test2 = open(Newdir,'w')
 for lines in file_test.readlines():
 strdata = ",".join(lines.split('\t'))
 file_test2.write(strdata)
 file_test.close()
 file_test2.close()

#数据提取
import os 
import pandas as pd
import numpy as np
number = -1;
sudu=np.zeros(5247*5,dtype=float).reshape(5247,5)
for files in filelist1:
 number +=1
 data = pd.read_csv(str(number+1)+'a.csv')
 sudu[:,number]=data['velocity']
 x = data['x']
 y = data['y']
a = sudu[0:5184,0].reshape(81,64)
%matplotlib inline
import matplotlib.pyplot as plt
extent = [np.min(x),np.max(x),np.min(y),np.max(y)]
plt.subplot(231)
u0 = sudu[0:5184,0].reshape(81,64)
plt.imshow(u0,extent=extent,origin='lower')
plt.subplot(232)
u1 = sudu[0:5184,1].reshape(81,64)
plt.imshow(u1,extent=extent,origin='lower')
plt.subplot(233)
u2 = sudu[0:5184,2].reshape(81,64)
plt.imshow(u2,extent=extent,origin='lower')
plt.subplot(234)
u3 = sudu[0:5184,3].reshape(81,64)
plt.imshow(u3,extent=extent,origin='lower')
#plt.axis("equal")
plt.subplot(235)
u4 = sudu[0:5184,4].reshape(81,64)
plt.imshow(u4,extent=extent,origin='lower')
plt.subplot(236)
u5 = sudu[0:5184,4].reshape(81,64)
plt.imshow(u5,extent=extent,origin='lower')
#contour
cs = plt.contour(u5, 20,extent = extent)
plt.xlim(-0.8,0.8)
plt.ylim(0.6,2.2)
plt.axis('equal')