[Python]Common Syntax Collections

global c

nonlocal c

UnboundLocalError: local variable 'cnt' referenced before assignment

if condition_1:
    statement_block_1
elif condition_2:
    statement_block_2
else:
    statement_block_3

print("a=%d,b=%d" % (f(x,n), g(x,n)))

print('x={:d}, y={:d}'.format(f(x,n), g(x,n)))

print(f'a={f(x,n):d}, b={g(x,n):d}')

name = "bob"
print(f'Hello {name} ! I want to print }} and {{ or {{ }}')

my_string = "{}, is a {} {} science portal for {}"
print(my_string.format("GeeksforGeeks", "computer", "geeks"))

file_path = '{}/test.txt'.format(work_dir)

txt = "I like bananas"
x = txt.replace("bananas", "apples")
print(x) #I like apples

i = 255
print('Zero Padding: {:08}'.format(i))
# Zero Padding: 00000255

string1 = 'Hello'
string2 = 'hello'

if string1.lower() == string2.lower():
    print "The strings are the same (case insensitive)"
else:
    print "The strings are not the same (case insensitive)"

s = 'ß'
s.lower() #  'ß'
s.casefold() # 'ss'

string = "one,two,three"
words = string.split(',')
print(words)

string = "freeCodeCamp"
print(string[2:6])

import re
line = re.sub(r"</?\[\d+>", "", line)

import re
title_regex = re.compile(r'".*"$')
title = title_regex.search('title= "Hello World"')
print(title.group())

import string
import random
import secrets

def id_generator(size=16, chars=string.ascii_uppercase + string.ascii_lowercase + string.digits + string.punctuation):
    return ''.join(secrets.choice(chars) for i in range(size))
    
print(id_generator())

>>> type([]) is list
True
>>> type({}) is dict
True
>>> type('') is str
True
>>> type(0) is int
True
>>> type({})
<type 'dict'>
>>> type([])
<type 'list'>

>>> isinstance(b, Test1)
True
>>> isinstance(b, Test2)
True
>>> isinstance(a, Test1)
True
>>> isinstance(a, Test2)
False
>>> isinstance([], list)
True
>>> isinstance({}, dict)
True

>>> a = iter(list(range(10)))
>>> for i in a:
...    print(i)
...    next(a)
... 
0
1
2
3
4
5
6
7
8
9

>>> a = iter(list(range(10)))
>>> for i in a:
...    print(i)
...    _ = next(a)
... 
0
2
4
6
8

class image:
    def __init__(self):
        self.address = ''
        self.label = 1
        self.storage = 1

single_image = image()
single_image.address = 'xxx'
single_image.label = 3
single_image.storage = 10

images = []
images.append(single_image)

import operator
images.sort(key=operator.attrgetter('storage'))

aList = []
aList.append( 1001 )
aList.append( 'abc' )
print(aList) #[1001, 'abc']

aList = [1001, 'abc']
print(aList[1]) #abc

animals = ['cat', 'dog', 'rabbit', 'horse']
index = animals.index('rabbit')
print(index) #2

aList = [1001, 'abc']
del aList[1]    # removing second element
print(aList)    # Output: [1001]
del aList       # deleting entire array
print(aList)    # Error: array is not defined

dict = {'Name': 'Runoob', 'Age': 27}
print "Value : %s" %  dict.get('Age')
print "Value : %s" %  dict.get('Sex', "Not Available")

test_dict = {"Arushi" : 22, "Anuradha" : 21, "Mani" : 21, "Haritha" : 21}
del test_dict['Mani']

for key, val in PIX0.iteritems():
    NUM = input("Which standard has a resolution of {!r}?".format(val))
    if NUM == key:
        print ("Nice Job!")
        count = count + 1
    else:
        print("I'm sorry but thats wrong. The correct answer was: {!r}.".format(key))

for key, val in PIX0.items():
    NUM = input("Which standard has a resolution of {!r}?".format(val))
    if NUM == key:
        print ("Nice Job!")
        count = count + 1
    else:
        print("I'm sorry but thats wrong. The correct answer was: {!r}.".format(key))

for key in obj.keys():
    val = obj.get(key)

for key in list(dict_2.keys()):
    if dict_1.get(key, "null") != 'null':
        del dict_2[key]

#!python2
print "hello"

#!python3
print("hello")

Py -3 hello.py

Py -2 hello.py

if __name__ == "__main__":
    print("m1")
print("t2")