String Methods (python)

String Methods

• Slicing

With slicing we can access substrings. It can get optional start and stop indices.

a='pythonfullstack'
a= a[3:9]
# 'honful'

• strip()

strip() method makes the string Return a copy of the string with the leading and trailing characters removed. default characters of this method removes whitespace

a= '      python    '
a= a.strip()
#'python'

• replace() Return a copy of the string with all occurrences of substring old replaced by new.

a= ' hi folks'
a= a.replace('hi','hello')
# ' hello folks'

• split() split() methods uses for returning the list of words in a string, using sep as the delimiter string

a= ' hi folks good morning'
a= a.split()
# ['hi', 'folks', 'good' ,'morning']

• join() Return a string which is the concatenation of the strings in iterable.

a=['hi', 'folks', 'good' ,'morning']
a= ' '.join(a)
# 'hi folks good morning'

• upper(), lower(), capitalize() Return a copy of the string with all the cased characters converted to uppercase, lowercase, or first character capitalized and the rest lowercased.

a= 'python'
a= a.upper()
#'PYTHON'
a='pyThOn'
a= a.lower()
# 'python'
a= 'pyTHoN'
a=a.capitalize()
# 'Python'

• isalpha(), isnumeric(), isalnum()

isalpha() is to check a string whether it contains alphabets only.

isnumeric() is to check a string whether it contains numbers only.

isalnum() is to check a string whether it contains alphabets or numbers.

s= 'justchill'
s.isalpha() #output : True
s='9887'
s.isnumeric() # output: True
s='30jno'
s.isalnum() #output: True

• count() count() method is used to count the particular substrings in a string.

s='hello'
s.count('l') # 2

• find() Return the lowest index in the string where substring sub is found within the slice s[start:end]

s= 'run python'
ind= s.find('y') # 5

• swapcase()

Return a copy of the string with uppercase characters converted to lowercase and vice versa.

s= 'HeLLo'
s=s.swapcase()
# 'hEllO'