# coding: utf-8

# In[1]:

import numpy as np
arr = np.arange(0,11)
arr


# In[2]:

arr[8]


# In[3]:

arr[1:5]


# In[4]:

arr[0:5]


# In[7]:

arr[0:5] = 100
arr


# In[8]:

arr = np.arange(0,11)
arr


# In[9]:

slice_of_arr = arr[0:6]
slice_of_arr


# In[10]:

arr_copy = arr.copy()
arr_copy


# In[12]:

arr2nd = np.array(([5,10,15],[20,25,30],[35,40,45]))
arr2nd


# In[15]:

arr2nd[1]


# In[16]:

arr2nd[1][0]


# In[17]:

arr2nd[:2,1:]


# In[18]:

arr2nd


# In[19]:

arr2nd[2]


# In[21]:

arr2nd = np.zeros((10,10))
arr2nd


# In[23]:

arrlength = arr2nd.shape[1]
arrlength


# In[ ]:

for i in range(arrlength):
    arr2nd[i]=1


# In[24]:

arr2nd


# In[25]:

for i in range(arrlength):
    arr2nd[i]=1
arr2nd


# In[27]:

for i in range(arrlength):
    arr2nd[i]=i
arr2nd


# In[28]:

arr2nd[[2,4,6,8]]


# In[ ]: