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

# # Module 2
# 
# ## Video 10: Example Functions
# **Python for the Energy Industry**
# 
# Python has a number of 'built-in' functions you can use. You are already familiar with some of these, including `print` and `range`. In this lesson we will look at some built in functions in more detail.
# 
# You have seen how `range` works with a single argument. It can also be used with two or three arguments:

# In[1]:


# only one argument - all numbers up to 5
print([i for i in range(5)])


# In[2]:


# two arguments - numbers between 2 and 5
print([i for i in range(2,5)])


# In[3]:


# three arguments - numbers between 1 and 9 at multiples of 2
print([i for i in range(1,9,2)])


# The function `len` will count the number of items in a list, or the number of letters in a string:

# In[4]:


my_list = [1,2,4,6,8,13,19]
my_string = 'test_string'

print('length of my_list:', len(my_list))
print('length of my_string:', len(my_string))


# There are a number of functions that convert a value from one type to another type. These are:

# In[5]:


int(1)


# In[6]:


str(1)


# In[7]:


float(1)


# In[8]:


bool(1)


# In[ ]: