String Operations
Python 3 has three string types
- str() is for unicode
- bytes() is for binary data
- bytesarray() mutable variable of bytes
Create some simulated text.
string = 'The quick brown fox jumped over the lazy brown bear.'
Capitalize the first letter.
string_capitalized = string.capitalize()
string_capitalized
'The quick brown fox jumped over the lazy brown bear.'
Center the string with periods on either side, for a total of 79 characters
string_centered = string.center(79, '.')
string_centered
'..............The quick brown fox jumped over the lazy brown bear..............'
Count the number of e’s between the fifth and last character
string_counted = string.count('e', 4, len(string))
string_counted
4
Locate any e’s between the fifth and last character
string_find = string.find('e', 4, len(string))
string_find
24
Are all characters are alphabet?
string_isalpha = string.isalpha()
string_isalpha
False
Are all characters digits?
string_isdigit = string.isdigit()
string_isdigit
False
Are all characters lower case?
string_islower = string.islower()
string_islower
False
Are all chracters alphanumeric?
string_isalnum = string.isalnum()
string_isalnum
False
Are all characters whitespaces?
string_isalnum = string.isspace()
string_isalnum
False
Is the string properly titlespaced?
string_istitle = string.istitle()
string_istitle
False
Are all the characters uppercase?
string_isupper = string.isupper()
string_isupper
False
Return the lengths of string
len(string)
52
Convert string to lower case
string_lower = string.lower()
string_lower
'the quick brown fox jumped over the lazy brown bear.'
Convert string to lower case
string_upper = string.upper()
string_upper
'THE QUICK BROWN FOX JUMPED OVER THE LAZY BROWN BEAR.'
Convert string to title case
string_title = string.title()
string_title
'The Quick Brown Fox Jumped Over The Lazy Brown Bear.'
Convert string the inverted case
string_swapcase = string.swapcase()
string_swapcase
'tHE QUICK BROWN FOX JUMPED OVER THE LAZY BROWN BEAR.'
Remove all leading whitespaces (i.e. to the left)
string_lstrip = string.lstrip()
string_lstrip
'The quick brown fox jumped over the lazy brown bear.'
Remove all leading and trailing whitespaces (i.e. to the left and right)
string_strip = string.strip()
string_strip
'The quick brown fox jumped over the lazy brown bear.'
Remove all trailing whitespaces (i.e. to the right)
string_rstrip = string.rstrip()
string_rstrip
'The quick brown fox jumped over the lazy brown bear.'
Replace lower case e’s with upper case E’s, to a maximum of 4
string_replace = string.replace('e', 'E', 4)
string_replace
'ThE quick brown fox jumpEd ovEr thE lazy brown bear.'
Python Example for Beginners
Two Machine Learning Fields
There are two sides to machine learning:
- Practical Machine Learning:This is about querying databases, cleaning data, writing scripts to transform data and gluing algorithm and libraries together and writing custom code to squeeze reliable answers from data to satisfy difficult and ill defined questions. It’s the mess of reality.
- Theoretical Machine Learning: This is about math and abstraction and idealized scenarios and limits and beauty and informing what is possible. It is a whole lot neater and cleaner and removed from the mess of reality.
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