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

# In[1]:


from siuba.dply.verbs import Var, VarList, var_select
from siuba import _
import pandas as pd
from pandas import DataFrame, Series


# ## exclusion 

# In[2]:


v = VarList()
colnames = ['a', 'b', 'c', 'd']
var_select(
    colnames,
    v.x == v.a,
    -v.d,
    )


# ## methods

# In[3]:


colnames = ["home_phone", "home_address", "other", "misc"]
var_select(
    colnames,
    v.startswith("home"),
    v.misc
)


# ## slicing

# In[4]:


colnames = ["home_phone", "home_address", "other", "misc"]
var_select(
    colnames,
    v[v.home_phone:v.home_address]
)


# ## misc

# In[5]:


f = _.startswith("a")
f(v)