Returns True if all chars in a string are printable , otherwise rturns False
my_str='Welcome to plus2net'
print(my_str.isprintable()) # Output is False
my_str='Welcome \t to plus2net'
print(my_str.isprintable()) # Output is False ( presence of Tab \t)
my_str='Welcome to plus2net \n'
print(my_str.isprintable()) # Output is False ( presence of line break \n)
my_str='1234'
print(my_str.isprintable()) # Output is True