Python中读取txt文本中的输入，输出，w，b等数据，并画出其分布图

#read input,output,w,b data,画出其分析图
import os
import math
import numpy as np
import matplotlib.pyplot as plt
#filename='b'+i+'_'+j+'.txt'
#filename='w'+i+'_'+j+'.txt'
#filename='output'+i+'_'+j+'.txt'
#filename='input1.txt'
#filename =input("please input the filename:")

#依次遍历每一个txt文件
for i in range (6):
  for j in range (5):
    filename='b'+str(i)+'_'+str(j)+'.txt' 
    if os.path.exists(filename): #判断文件是否存在
      print(filename)
      data = np.loadtxt(filename) #用numpyload文本
      l=len(data) 
      print(l)
      num_bins=l #是画直方图中hist的属性，主要用来表示横坐标分组的个数
      plt.hist(data,num_bins)#,normed=0,histtype='bar',facecolor='yellowgreen',alpha=0.75,rwidth=0.5
      plt.title(filename) #plt出图的标题显示
      plt.savefig('/data1/ljw/Documents/W_graph/graph/'+filename+'.png') #自动将图像保存的路径
      plt.close() #每输出一个图像后，在输出下一幅图像之前关闭当前图像，防止叠加
# plt.subplots_adjust(hspace=0.4)
      #plt.show()

filename='b_f.txt'
if os.path.exists(filename):
      print(filename)
      data = np.loadtxt(filename)
      l=len(data)
      print(l)
      num_bins=l
      plt.hist(data,num_bins)
      plt.title(filename)
      plt.savefig('/data1/ljw/Documents/W_graph/graph/'+filename+'.png')
      plt.close()
      #plt.show()

for i in range (6):
  for j in range (5):
    filename='w'+str(i)+'_'+str(j)+'.txt'
    if os.path.exists(filename):
      print(filename)
      data = np.loadtxt(filename)
      l=len(data)
      print(l)
      num_bins=400
      plt.hist(data,num_bins)
      plt.title(filename)
      plt.savefig('/data1/ljw/Documents/W_graph/graph/'+filename+'.png')
      plt.close()
      #plt.show()

filename='out1_2.txt'
if os.path.exists(filename):
      print(filename)
      data = np.loadtxt(filename)
      l=len(data)
      print(l)
      num_bins=200
      plt.hist(data,num_bins)
      plt.title(filename)
      plt.savefig('/data1/ljw/Documents/W_graph/graph/'+filename+'.png')
      plt.show()
      plt.close()
      print(10)

for i in range (6):
  for j in range (5):
    filename='out'+str(i)+'_'+str(j)+'.txt'
    if os.path.exists(filename):
      print(filename)
      data = np.loadtxt(filename)
      l=len(data)
      print(l)
      num_bins=20
      plt.hist(data,num_bins)
      plt.title(filename)
      plt.savefig('/data1/ljw/Documents/W_graph/graph/'+filename+'.png')
      plt.close()
      #plt.show()

filename='input1.txt'
if os.path.exists(filename):
      print(filename)
      data = np.loadtxt(filename)
      l=len(data)
      print(l)
      num_bins=400
      plt.hist(data,num_bins)
      plt.title(filename)
      plt.savefig('/data1/ljw/Documents/W_graph/graph/'+filename+'.png')
      #plt.show()
      plt.close()
filename='output.txt'
if os.path.exists(filename):
      print(filename)
      data = np.loadtxt(filename)
      l=len(data)
      print(l)
      num_bins=400
      plt.hist(data,num_bins)
      plt.title(filename)
      plt.savefig('/data1/ljw/Documents/W_graph/graph/'+filename+'.png')
      #plt.show()
      plt.close()