Python String Operation Basics

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    First of all,python strings can not be changed,because they are immutable.

• String escape

'Isn\'t,he said'
"Isn\"t,he said"

 

• more readable string

   

print("Isn\"t,he said")

•  do not want to escape

print(r'C:some\name')

 

•  String concatenating

 

"py" + "pyon"
"py" "pyon" #works
prefix="py"
prefix "thon" #does't work
3 * "un" "beat" #does't work
prefix + (3 * "un") #works

 

•  String indexing

word="python"
word[0] #'p'
word[-1] #'n'

•  String slicing

word="python"
word[0:2] #'py'

 

•  String length

     the build-in function len() returns the length of a string.