title: how to handle async error in ib_insync with python3.7?
body: <p>Sorry I may ask a stupid question but I am just a beginner in python and algotrading. I am now using Python 3.7 and ibapi with ib_insync to try connect TWS. However, as Python 3.7 use async as a keyword so when I try to code with ib_insync:</p>
  
  <pre><code>from ib_insync import *
  
  ib = IB()
  ib.connect('127.0.0.1', 7496, clientId=1)
  
  contract = Forex('EURUSD')
  bars = ib.reqHistoricalData(contract, endDateTime='', durationStr='30 D', barSizeSetting='1 hour', whatToShow='MIDPOINT', useRTH=True)
  
  df = util.df(bars)
  print(df['date', 'open', 'high', 'low', 'close'])
  </code></pre>
  
  <p>It end up like this:</p>
  
  <pre class="lang-none prettyprint-override"><code>File "C:/Users/leung/Documents/MONEY/Algotrade/venv/test1.py", line 1, in &lt;module&gt;
      from ib_insync import *
    File "C:\Users\leung\AppData\Local\Programs\Python\Python37-32\lib\site-packages\ib_insync\__init__.py", line 24, in &lt;module&gt;
      from .ib import *
    File "C:\Users\leung\AppData\Local\Programs\Python\Python37-32\lib\site-packages\ib_insync\ib.py", line 11, in &lt;module&gt;
      from ib_insync.client import Client
    File "C:\Users\leung\AppData\Local\Programs\Python\Python37-32\lib\site-packages\ib_insync\client.py", line 10, in &lt;module&gt;
      from ibapi.client import EClient
    File "&lt;frozen importlib._bootstrap&gt;", line 983, in _find_and_load
    File "&lt;frozen importlib._bootstrap&gt;", line 963, in _find_and_load_unlocked
    File "&lt;frozen importlib._bootstrap&gt;", line 906, in _find_spec
    File "&lt;frozen importlib._bootstrap_external&gt;", line 1280, in find_spec
    File "&lt;frozen importlib._bootstrap_external&gt;", line 1254, in _get_spec
    File "&lt;frozen importlib._bootstrap_external&gt;", line 1235, in _legacy_get_spec
    File "&lt;frozen importlib._bootstrap&gt;", line 441, in spec_from_loader
    File "&lt;frozen importlib._bootstrap_external&gt;", line 594, in spec_from_file_location
    File "C:\Users\leung\AppData\Local\Programs\Python\Python37-32\lib\site-packages\ibapi-9.73.7-py3.7.egg\ibapi\client.py", line 60
      self.async = False
               ^
  SyntaxError: invalid syntax
  
  Process finished with exit code 1
  </code></pre>
  
  <p>I know I need to change the name async to other name. I tried to modify the file client.py in ibapi but it seems not work at all. Which part of code I should change in order to get it work?</p>