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Python Articles
Page 826 of 855
String Special Operators in Python
Assume string variable a holds 'Hello' and variable b holds 'Python', then −Sr.NoOperator & DescriptionExample1+Concatenation - Adds values on either side of the operatora + b will give HelloPython2*Repetition - Creates new strings, concatenating multiple copies of the same stringa*2 will give-HelloHello3[]Slice - Gives the character from the given indexa[1] will give e4[ : ]Range Slice - Gives the characters from the given rangea[1:4] will give ell5inMembership - Returns true if a character exists in the given stringH in a will give 16not inMembership - Returns true if a character does not exist in the given stringM not in a ...
Read MoreHow to insert a Python object in MySQL?
Assuming that a MySQL database named 'test' is present on the server and a table named employee is also created. Let the table have five fields fname, lname, age, gender, and salary.Suppose we want to insert a tuple object containing data of a record defined as follows into the Msql database.t1=('Steven', 'Assange', 21, 'M', 2001)To establish an interface between MySQL and Python 3, you need to install the PyMySQL module. Then you can set up the connection using the following statementsimport PyMySQL # Open database connection db = PyMySQL.connect("localhost", "root", "", "test" ) # prepare a cursor object using cursor() ...
Read MoreLoop Control Statements in Python
Loop control statements change execution from its normal sequence. When execution leaves a scope, all automatic objects that were created in that scope are destroyed.Python supports the following control statements. Click the following links to check their detail.Let us go through the loop control statements brieflySr.NoOperator & Description1break statementTerminates the loop statement and transfers execution to the statement immediately following the loop.2continue statementCauses the loop to skip the remainder of its body and immediately retest its condition prior to reiterating.3pass statementThe pass statement in Python is used when a statement is required syntactically but you do not want any command ...
Read MoreData Type Conversion in Python
Sometimes, you may need to perform conversions between the built-in types. To convert between types, you simply use the type name as a function.There are several built-in functions to perform conversion from one data type to another. These functions return a new object representing the converted value.Sr.No.Function & Description1int(x [, base])Converts x to an integer. base specifies the base if x is a string.2long(x [, base] )Converts x to a long integer. base specifies the base if x is a string.3float(x)Converts x to a floating-point number.4complex(real [, imag])Creates a complex number.5str(x)Converts object x to a string representation.6repr(x)Converts object x to ...
Read MoreMultiple Statements in Python
Multiple Statements on a Single LineThe semicolon ( ; ) allows multiple statements on the single line given that neither statement starts a new code block. Here is a sample snip using the semicolon −import sys; x = 'foo'; sys.stdout.write(x + '')Multiple Statement Groups as SuitesA group of individual statements, which make a single code block are called suites in Python. Compound or complex statements, such as if, while, def, and class require a header line and a suite.Header lines begin the statement (with the keyword) and terminate with a colon ( : ) and are followed by one or more lines ...
Read MoreNumber Data Type in Python
Number data types store numeric values. Number objects are created when you assign a value to them. For example −var1 = 1var2 = 10You can also delete the reference to a number object by using the del statement. The syntax of the del statement is −del var1[, var2[, var3[...., varN]]]]You can delete a single object or multiple objects by using the del statement. For example −del vardel var_a, var_bPython supports four different numerical types −int (signed integers)long (long integers, they can also be represented in octal and hexadecimal)float (floating point real values)complex (complex numbers)ExamplesHere are some examples of numbers −intlongfloatcomplex1051924361L0.03.14j1051924361L0.03.14j100-0x19323L15.2015.20-7860122L-21.99.322e-36j0800xDEFABCECBDAECBFBAEl32.3+e18876j-0490535633629843L-90.-.6545+0J-0x260-052318172735L-32.54e1003e+26J0x69-4721885298529L70.2-E124.53e-7jPython ...
Read MoreQuotation in Python
Python accepts single ('), double (") and triple (''' or """) quotes to denote string literals, as long as the same type of quote starts and ends the string.The triple quotes are used to span the string across multiple lines. For example, all the following are legal −word = 'word' sentence = "This is a sentence." paragraph = """This is a paragraph. It is made up of multiple lines and sentences."""
Read MoreLines and Indentation in Python
Python provides no braces to indicate blocks of code for class and function definitions or flow control. Blocks of code are denoted by line indentation, which is rigidly enforced.The number of spaces in the indentation is variable, but all statements within the block must be indented the same amount. For example −if True: print "True" else: print "False"However, the following block generates an error −if True: print "Answer" print "True" else: print "Answer" print "False"Thus, in Python all the continuous lines indented with same number of spaces would form a block. The following example has various statement blocks −Note − ...
Read MoreWhat are Python Identifiers?
A Python identifier is a name used to identify a variable, function, class, module or other object. An identifier starts with a letter A to Z or a to z or an underscore (_) followed by zero or more letters, underscores and digits (0 to 9).Python does not allow punctuation characters such as @, $, and % within identifiers. Python is a case sensitive programming language. Thus, Manpower and manpower are two different identifiers in Python.Here are naming conventions for Python identifiers −Class names start with an uppercase letter. All other identifiers start with a lowercase letter.Starting an identifier with ...
Read MorePython Environment Variables
Here are important environment variables, which can be recognized by Python −Sr.No.Variable & Description1PYTHONPATHIt has a role similar to PATH. This variable tells the Python interpreter where to locate the module files imported into a program. It should include the Python source library directory and the directories containing Python source code. PYTHONPATH is sometimes preset by the Python installer.2PYTHONSTARTUPIt contains the path of an initialization file containing Python source code. It is executed every time you start the interpreter. It is named as .pythonrc.py in Unix and it contains commands that load utilities or modify PYTHONPATH.3PYTHONCASEOKIt is used in Windows ...
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