#!/usr/bin/env python
# coding: utf-8

# # Polite error messages in IPython
# 
# IPython allows registering a custom exception hook,
# which lets you do whatever you want when an error occurs.
# 
# If you want to hide the scary details of tracebacks for a bit,
# you might use this.
# 
# Here is an example showing a specific error message for NameErrors,
# and showing just the error message instead of a traceback for the rest.
# 
# Careful! Eliminating the traceback can make it a lot harder to find where the mistake is.

# In[1]:


def polite_errors(ip, etype, evalue, tb, tb_offset=None):
    if etype is NameError:
        print("Oops! looks like {}."
              " Did you forget something or make a typo?".format(evalue))
    # elif other special errors you can make nice
    else:
        # fallback on just error type and message (no traceback)
        print("%s: %s" % (etype.__name__, evalue))
    
get_ipython().set_custom_exc((Exception,), polite_errors)


# In[2]:


undefined


# In[3]:


{}['a']


# In[4]:


1/0


# In[4]:


def foo()
    pass