Python基础篇 strings 02

In [1]: strObj = "This is a sample string"

In [2]: index = 5
   ...: # Slice string to remove character at index 5
   ...: if len(strObj) > index:
   ...:     strObj = strObj[0 : index : ] + strObj[index + 1 : :]
   ...:

In [3]: print('Modified String : ', strObj)
Modified String :  This s a sample string

In [4]: strObj = "This is a sample string"
   ...:
   ...: # Slice string to remove first character
   ...: strObj = strObj[1 : : ]
   ...:
   ...: print('Modified String : ' , strObj)
Modified String :  his is a sample string

In [5]: strObj = "This is a sample string"
   ...:
   ...: # Slice string to remove last character
   ...: strObj = strObj[:-1:]
   ...:
   ...: print('Modified String : ', strObj)
Modified String :  This is a sample strin

Modified String :  This is a sample strin

In [6]: strObj = "This is a sample string"
   ...:
   ...: start = 5
   ...: stop = 10
   ...: # Remove charactes from index 5 to 10
   ...: if len(strObj) > stop :
   ...:     strObj = strObj[0: start:] + strObj[stop + 1::]
   ...:
   ...: print('Modified String : ', strObj)
Modified String :  This ample string

In [7]: numStr = "5"
   ...: print('Original String :', numStr)
   ...:
   ...: # Left pad the string with 0 to make it's length 4
   ...: numStr = numStr.zfill(4)
   ...:
   ...: print('Updated String :' , numStr)
Original String : 5
Updated String : 0005

In [9]: numStr = "5"
   ...: print('Original String :', numStr)
   ...:
   ...: # Make string right justified of length 4 by padding 3 spaces to left
   ...: numStr = numStr.rjust(4, ' ')
   ...:
   ...: print('Updated String :', numStr)
Original String : 5
Updated String :    5

In [10]: numStr = "5"
    ...: print('Original String :', numStr)
    ...:
    ...: # Make string right justified of length 4 by padding 3 '-' to left
    ...: numStr = numStr.rjust(4, '-')
    ...:
    ...: print('Updated String :', numStr)
Original String : 5
Updated String : ---5

In [11]: numStr = "45"
    ...: print('Original String :', numStr)
    ...:
    ...: # Make string left justified of length 5 by padding 3 0s to the right of it
    ...: numStr = numStr.ljust(5, '0')
    ...:
    ...: print('Updated String :', numStr)
Original String : 45
Updated String : 45000

In [12]: userName = "John"
    ...: print('Original String :', userName)
    ...:
    ...: # Make string left justified of length 7 by padding 3 spaces to the right of it
    ...: userName = userName.ljust(7, ' ')
    ...:
    ...: print('Updated String :' , userName, 'is')
Original String : John
Updated String : John    is

In [13]: userName = "John"
    ...: print('Original String :', userName)
    ...:
    ...: # Make string left justified of length 7 by padding 3 '-' to the right of it
    ...: userName = userName.ljust(7, '-')
    ...:
    ...: print('Updated String :' , userName)
Original String : John
Updated String : John---

In [14]: firstStr = "sample"
    ...: secStr   = "sample"

In [15]: if firstStr == secStr:
    ...:     print('Both Strings are same')
    ...: else:
    ...:     print('Strings are not same')
    ...:
Both Strings are same

In [16]: firstStr = "SAMple"
    ...: secStr = "sample"

In [17]: if firstStr.lower() == secStr.lower():
    ...:     print('Both Strings are same')
    ...: else:
    ...:     print('Strings are not same')
    ...:
Both Strings are same

In [18]: firstStr = "this is"
    ...: secStr   = "not this"

In [19]: if firstStr != secStr:
    ...:     print('Both Strings are not equal')
    ...: else:
    ...:     print('Strings are equal')
    ...:
Both Strings are not equal

In [20]: if "abcd" > "abcc":
    ...:     print('"abcd" is greater than "abcc"')
    ...:
    ...: if "Abc" < "abc":
    ...:     print('"Abc" is less than "abc"')
    ...:
    ...: if "abcdd" > "abc":
    ...:     print('"abcdd" is greater than "abc"')
    ...:
"abcd" is greater than "abcc"
"Abc" is less than "abc"
"abcdd" is greater than "abc"

In [25]: firstStr = "sample"
    ...: secStr   = "sample"

In [26]: if firstStr is secStr:
    ...:     print('Both the objects are equal i.e. points to same object')
    ...:
    ...: print("Object ID of First object :" , id(firstStr))
    ...: print("Object ID of Second object :", id(secStr))
Both the objects are equal i.e. points to same object
Object ID of First object : 2601013061256
Object ID of Second object : 2601013061256
In [27]: if firstStr is secStr:
    ...:     print('Both the objects are equal')
    ...:
Both the objects are equal

In [29]: secStr = "sample is".split()[0]

In [30]: secStr
Out[30]: 'sample'

In [31]: print('firstStr: ', firstStr, " : Object ID :", id(firstStr))
    ...: print('secStr: ', secStr, " : Object ID :", id(secStr))
firstStr:  sample  : Object ID : 2601013061256
secStr:  sample  : Object ID : 2601044964272

In [32]: if firstStr is secStr:
    ...:     print('Both the objects are equal i.e. points to same object')
    ...: else:
    ...:     print('Both the objects are different')
    ...:
Both the objects are different

In [33]: if firstStr == secStr:
    ...:     print('Contents of both Strings are same')
    ...:
Contents of both Strings are same

In [34]: import re
    ...:
    ...: # Create regex pattern
    ...: regexPattern = re.compile("192.122.78.*")
    ...:
    ...: listOfIps = [ "192.122.78.11", "192.122.78.305" , "192.122.77.111"]
    ...:
    ...: # Check if strings in list matches the regex pattern
    ...: for ipStr in listOfIps:
    ...:     matchObj = regexPattern.fullmatch(ipStr)
    ...:     if matchObj:
    ...:         print('Contents of string ' ,ipStr , ' matched the pattern')
    ...:     else:
    ...:         print('Contents of string ' ,ipStr , ' do not matched the pattern')
    ...:
Contents of string  192.122.78.11  matched the pattern
Contents of string  192.122.78.305  matched the pattern
Contents of string  192.122.77.111  do not matched the pattern