Edit photo - Picture frame - Image effects in Python

from skimage import data, io
import sys
from skimage.color import gray2rgb

try:
    rgb_image = data.imread(sys.argv[1])
    height = rgb_image.shape[0]
    width = rgb_image.shape[1]

    if(len(rgb_image.shape) < 3):
        rgb_image = gray2rgb(rgb_image)
   
    for i,j in zip(range(int(width/8)), range(int(width/8),0,-1)):
        rgb_image[i, 0:j, :] = 0
   
    for i,j in zip(range(int(7*(height/8)),height), range(0,int(width/8))):
        rgb_image[i, 0:j, :] = 0
   

Edit photo - Square crop - Image resizing in Python

from skimage import data, io
import sys
from skimage.color import gray2rgb

try:
    rgb_image = data.imread(sys.argv[1])
    height = rgb_image.shape[0]
    width = rgb_image.shape[1]

    if height == width:
        print("already square image")
   
    else:
        if(len(rgb_image.shape) < 3):
            rgb_image = gray2rgb(rgb_image)
           
        right_image = rgb_image.copy()
        left_image = rgb_image.copy()
        center_image = rgb_image.copy()
       

Edit photo - Oil painting effect - Image manipulation in Python

from skimage import data, io
import random
import sys
from skimage.color import gray2rgb

try:
    rgb_image = data.imread(sys.argv[1])
    height = rgb_image.shape[0]
    width = rgb_image.shape[1]

    if(len(rgb_image.shape) < 3):
        rgb_image = gray2rgb(rgb_image)
   
    for i in range(height):
        for j in range(width):
            for k in range(rgb_image.shape[2]):

Edit photo - Pencil sketch effect - Image processing in Python

Code:
from skimage import data, io, util
import random
import sys
from skimage.color import rgb2gray

try:
    rgb_image = data.imread(sys.argv[1])
   
    height = rgb_image.shape[0]
    width = rgb_image.shape[1]
   
    if(len(rgb_image.shape) == 3):
        rgb_image = util.img_as_ubyte(rgb2gray(rgb_image))

Python: Count occurences in List

1. Histogram

>>> mylist = [1,3,2,5,4,4,2,2,4,2,4,2,4,6,4,5,2]

>>> import matplotlib.pyplot as plt

>>> plt.hist(mylist)
(array([ 1.,  0.,  6.,  0.,  1.,  0.,  6.,  0.,  2.,  1.]), array([ 1. ,  1.5,  2. ,  2.5,  3. ,  3.5,  4. ,  4.5,  5. ,  5.5,  6. ]), <a list of 10 Patch objects>)

>>> plt.show()