concatenation:

• In python, concatenation is defined as "the process of combining or joining or merging one string with the other string".
•  It uses the plus operator for combining the strings.
• The string must be enclosed with single quotations or double.
• Type conversion is needed.
• We can combine an integer value with a string by using the str(int) function.
• The plus(+) operator is used to combine the string at the end of the string.
• The % string format operator is used to combine the string anywhere we want.

#write a python program to demonstrate concatenation function.

•  In python, we have another built-in method called startswith.
• startswith is used to check whether the string startswith this specified string.
• It returns the boolean type.
• If the string startswith gave specified string then it returns true else false.

• It consists of the 3 parameters.

1. value:  The value that the string starts with.
2. start:    The position to start the search of string.
3. end:  The position to end the search.

#write a python program to demonstrate the startswith method.

 strftime :

•  The method represents the string consists of data and time with objects as time and date or date time.
• The datetime class is imported from the date time module.
• It takes one or more input format codes and returns string representation.

• The list of format codes are:

1. %a:  It is used for weekdays representation in short forms as wed, thr, etc...
2. %A: It is used for weekdays representation in the full name as of Sunday, Monday.
3. %b: It is used for month name representation in short form as of Jan, Feb, etc
4. %B: It is used for month name representation in the full name as of April, May, etc.
5. %d: It is used as a representation of the day of the month as zero added.
6.  %-d: day of the month as a decimal number.
7. %m: Month as zero added decimal number. 
8. %-m: Month as a decimal number.
9. %H:  hours as zero added decimal number.
10. %-H: hours as a decimal number.
11. %M: minutes as zero added decimal number.
12. %-M: minutes as a decimal number.
13. %S: seconds as a zero added decimal number
14. %-S: seconds as a decimal number.
15. %J: day of the year as zero added decimal number.
16. %-J: day of the year as a decimal number.

#write a python program to demonstrate strftime function.

is numeric:

•  Is numeric is the built-in method that is used to check whether the string contains numbers or not.
• It returns the true when the string contains numbers, if the string does not contain numbers then it returns false.
• It is applicable for integers, Unicode values. and takes the exponents like 1/2.
• It is not applicable for float and negative values.
•  isnumeric does not have any parameters.
• For negative values to check whether they are numeric or not we have to remove the negative sign.

Example: a="12345"

                 a=str.isnumeric(a)

                 true

#write a python program to demonstrate the isnumeric function.

 is alpha:

• In python "is alpha" is the method used to check the alphabets whether they are present in the given string or substring.
• In isalpha, it must carry only alphabets.
• It carries the result in the boolean type
• If the string contains all alphabets then it returns true, else false.
• The isalpha is not applicable for the alphanumeric.
• It is the built-in function of python.

#write a python program to demonstrate is alpha function.

is digit() python:  

Example:  str="123456"

                 str.isdigit(str) retrns true

Beacuse "123456" is perfectly a digit.

               str=\u00B0

               str.isdigit(str)returns true

Because it takes the Unicode as digit characters.

#write a python code  to demonstrate isdigit() function.

1. a="7656734"
2. a=str.isdigit(a)
3. print(a)
4. b="2344.60 
5. b=str.isdigit(b)
6. print(b)
7. x="\u00B2"
8. x=str.isdiigt(x)
9. print(x)

output: true

            false

            true

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