title: How to reduce exe file size in pyinstaller
body: <p>I am trying to develop .exe file from my python script , but its size is more than 715MB , even i am using virtual environment for developing but still size is very big.</p>
  
  <p>These libraries i am using in my script:</p>
  
  <pre><code>import numpy as np 
  import pandas as pd
  import os
  import matplotlib.pyplot as plt
  import configparser
  </code></pre>
  
  <p>Steps for developing .exe</p>
  
  <pre><code>1）pip install virtualenv  #install virtualenv
  
  2）virtualenv name_env  #creat a virtualenv
  
  3）pip install your packages in  new virtualenv
  
  4）cmd and activate
  
  5）cd to the dir of python script
  
  4）pyinstaller -w -F  mainscript.py
  </code></pre>
  
  <p>Anyone can help to figure out where i am making mistake</p>
  
  <p>normally this app should be 42MB or less than 50MB</p>
  
  <p>but here size is 600MB+</p>