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

# In[1]:


print("Hello, World!")


# In[2]:


2 + 2


# In[3]:


5.3 / 2.4


# In[4]:


import math

math.sin(1)


# # This is a Mardown Heading 1
# 
# ## This is a Mardown Heading 2
# 
# ### This is a Mardown Heading 3
# 
# This is a **Markdown** *cell*
# 
# ````python
# 
# def sum(a, b):
#    ans = 2 + 2
#    return ans
# ````
# 
# > Quote text
# 
# Here is some fancy $\LaTeX$
# 
# $$
# \frac{\partial p}{\partial t} = \frac 1 \alpha \frac{\partial^2 p}{\partial x^2}
# $$

# In[5]:


def sum(a, b):
    return a + b


# In[6]:


sum(1,2)


# In[7]:


sum(2,2)


# In[8]:


def sum(a, b=2):
    return a + b


# In[9]:


sum(2)


# In[10]:


sum(4)


# In[11]:


def sum(*var_args):
    
    ans = 0
    for i in var_args:
        ans += i
        
    return ans


# In[12]:


sum(1,2)


# In[13]:


sum(1,2,3,4)


# In[14]:


sum(1,2,3,4,100)


# In[15]:


f = lambda x: x+2


# In[16]:


f(2)


# In[17]:


g = lambda x,y: x + y


# In[18]:


g(2,2)


# In[19]:


def test_sum():
    assert abs(sum(2,2) - 4) <= 1e-6


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