02 Sep Admin
DBMS stands for Database Management System. DBMS is a software package designed to define, manipulate, retrieve and manage data in a database. We can break it like this DBMS = Database + Management System. Database is a collection of data and Management System is a set of programs to store and retrieve those data. It also defines rules to validate and manipulate this data.
02 Sep Admin
In hierarchical database model the data are organized into a tree-like structure where each record is having one parent record and many children.This model structure allows the one-to-one and a one-to-many relationship between two/ various types of data.The main drawback of this model is that, it can have only one to many relationships between nodes.
02 Sep Admin
Introduction to HTML blocks
HTML ??? block level ?? inline 2 ??? ?? tags ???? ??? ?? ?? block level tags webpage ??? show ???? ?? ?? automatically ???? ???? ?? ??? ??? ?? line ?? space ???? ??? ??? common block level tags ?? ???? ??? ???? ???? ?? ??? ???
????? ????? ?? tags inline tags ???? ??? ?? ?? tags ???? ???? ???? ?? ?? webpage ??? ?? ???? ???? ???? ???? ?? tag ?? line ??? ?? show ?? ???? ??? ??? ?? <br /> tag ???????? ?? ??? ?? ???? ???? ?? ??? ??? ??? space ???? ???? ??? ??? inline tags ???? ??? ?? ??? ???
02 Sep Admin
DBMS is a software package designed to define, manipulate, retrieve and manage data in a database. DBMS stands for Database Management System. We can break it like this DBMS = Database + Management System. Database is a collection of data and Management System is a set of programs to store and retrieve those data. It also defines rules to validate and manipulate this data.
28 Aug Admin
for <var> in <iterable>:
<statement(s)>is a collection of objects—for example, a list or tuple. The in the loop body are denoted by indentation, as with all Python control structures, and are executed once for each item in . The loop variable takes on the value of the next element in each time through the loop.
Example–
a = ['apple', 'banana', 'mango'] for i in a: print(i) Output- apple banana mangoIn this example, <iterable> is the lista, and <var> is the variablei. Each time through the loop,itakes on a successive item ina, soprint()displays the values'apple','banana', and'mango', respectively. Aforloop like this is the Pythonic way to process the items in an iterable.
In Python, iterable means an object can be used in iteration. If an object is iterable, it can be passed to the built-in Python function iter(), which returns something called an iterator. Yes, the terminology gets a bit repetitive.
28 Aug Admin
while <expr>:
<statement(s)><statement(s)> represents the block to be repeatedly executed, often referred to as the body of the loop. This is denoted with indentation, just as in an if statement.
The controlling expression, <expr>, typically involves one or more variables that are initialized prior to starting the loop and then modified somewhere in the loop body.
When a while loop is encountered, <expr> is first evaluated in Boolean context. If it is true, the loop body is executed. Then <expr> is checked again, and if still true, the body is executed again. This continues until <expr> becomes false, at which point program execution proceeds to the first statement beyond the loop body.
Example–
n = 5
while n > 0:
n -= 1
print(n)Output-
4
3
2
1
0Here’s what’s happening in this example:
n is initially 5. The expression in the while statement header on line 2 is n > 0, which is true, so the loop body executes. Inside the loop body on line 3, n is decremented by 1 to 4, and then printed.3 is printed.n becomes 0. At that point, when the expression is tested, it is false, and the loop terminates. Execution would resume at the first statement following the loop body, but there isn’t one in this case.28 Aug Admin
Python Conditions and If statements
Python supports the usual logical conditions from mathematics:
These conditions can be used in several ways, most commonly in “if statements” and loops.
An “if statement” is written by using the if keyword.
Example–
x = 22
y = 160
if y > x:
print(“y is greater than x”)
Output–
y is greater than x
Elif
The elif keyword in pythons is used to check “if the previous conditions were not true, then try this condition”.
Example–
a = 12
b = 18
if a == b:
print(“a and b are equal”)
elif b > a:
print(“b is greater than a”)
Output–
b is greater than a
28 Aug Admin
A dictionary is a collection which is unordered, changeable and indexed. Each key is separated from its value by a colon (:), the items are separated by commas, and the whole thing is enclosed in curly braces. An empty dictionary without any items is written with just two curly braces, like this: {}.
Example–
thisdictionarie = {
“name”: “rohan”,
“age”: “23”,
“year”: 1996
}
print(thisdictonarie)
Output–
{‘name’: ‘rohan’, ‘age’: ’23’, ‘year’: 1996}
12 Apr Admin
A set is a collection which is unordered and unindexed. In Python sets are written with curly brackets.
Sets are unordered, so you cannot be sure in which order the items will appear.
Example–
theset = {“bus”, “car”, “aeroplane”}
print(theset)
Output–
{‘aeroplane’, ‘bus’, ‘car’}
28 Aug admin
There are four collection data types in the Python programming language:
A list is a collection which is ordered and changeable. In Python lists are written with square brackets.
alist = [“america”, “india”, “japan”]
print(alist)
Output-
['america', 'india', 'japan']
You access the list items by referring to the index number:
alist = [“apple”, “banana”, “cherry”]
print(alist[2])
output:-cherry
Recent Comments