All the IPython Notebooks in this lecture series are available at https://github.com/rajathkumarmp/Python-Lectures
The print statement can be used in the following different ways :
- print "Hello World" - print "Hello", <Variable Containing the String> - print "Hello" + <Variable Containing the String> - print "Hello %s" % <variable containing the string>
print "Hello World"
In Python, single, double and triple quotes are used to denote a string. Most use single quotes when declaring a single character. Double quotes when declaring a line and triple quotes when declaring a paragraph/multiple lines.
print """My name is Rajath Kumar M.P. I love Python."""
My name is Rajath Kumar M.P. I love Python.
Strings can be assigned to variable say string1 and string2 which can called when using the print statement.
string1 = 'World' print 'Hello', string1 string2 = '!' print 'Hello', string1, string2
Hello World Hello World !
String concatenation is the “addition” of two strings. Observe that while concatenating there will be no space between the strings.
print 'Hello' + string1 + string2
%s is used to refer to a variable which contains a string.
print "Hello %s" % string1
Similarly, when using other data types
- %s -> string - %d -> Integer - %f -> Float - %o -> Octal - %x -> Hexadecimal - %e -> exponential
This can be used for conversions inside the print statement itself.
print "Actual Number = %d" %18 print "Float of the number = %f" %18 print "Octal equivalent of the number = %o" %18 print "Hexadecimal equivalent of the number = %x" %18 print "Exponential equivalent of the number = %e" %18
Actual Number = 18 Float of the number = 18.000000 Octal equivalent of the number = 22 Hexadecimal equivalent of the number = 12 Exponential equivalent of the number = 1.800000e+01
When referring to multiple variables parenthesis is used.
print "Hello %s %s" %(string1,string2)
Hello World !
The following are other different ways the print statement can be put to use.
print "I want %%d to be printed %s" %'here'
I want %d to be printed here
Jan Feb Mar Apr May Jun Jul Aug
print "I want \\n to be printed."
I want \n to be printed.
print """ Routine: \t- Eat \t- Sleep\n\t- Repeat """
Routine: - Eat - Sleep - Repeat
#PrecisionWidth and FieldWidth
Fieldwidth is the width of the entire number and precision is the width towards the right. One can alter these widths based on the requirements.
The default Precision Width is set to 6.
"%f" % 3.121312312312
Notice upto 6 decimal points are returned. To specify the number of decimal points, ‘%(fieldwidth).(precisionwidth)f’ is used.
"%.5f" % 3.121312312312
If the field width is set more than the necessary than the data right aligns itself to adjust to the specified values.
"%9.5f" % 3.121312312312
Zero padding is done by adding a 0 at the start of fieldwidth.
"%020.5f" % 3.121312312312
For proper alignment, a space can be left blank in the field width so that when a negative number is used, proper alignment is maintained.
print "% 9f" % 3.121312312312 print "% 9f" % -3.121312312312
’+’ sign can be returned at the beginning of a positive number by adding a + sign at the beginning of the field width.
print "%+9f" % 3.121312312312 print "% 9f" % -3.121312312312
As mentioned above, the data right aligns itself when the field width mentioned is larger than the actualy field width. But left alignment can be done by specifying a negative symbol in the field width.
"%-9.3f" % 3.121312312312