CODEWITHSUNDEEP
python
alphanumeric
alphanumeric

Reputation: 19379

Python: How to check characters occurrence in string in one line

A string can be with both single '_' and double '__' underscore characters at the end. Checking it with :

if myString[-1]=='_': pass

works only for a single character. How to achieve the same using one line?

(only if last character(s)=='_' or '__').

Upvotes: 2

Views: 222

Answers (6)

alphanumeric
alphanumeric

Reputation: 19379

Thanks for your suggestions. Here is how I ended up using it:

myString='asdfasdf.__'
invalid=['!','"','#','$','%','&','\\','(',')','*','+',',','-','.','/'
                ,':',';','<','=','>','?','@','[',"'",']','^','`','{','|','}','~',' ','_']

while myString and myString[-1] in invalid:
    myString=myString.rstrip( invalid[ invalid.index(myString[-1]) ] )

Upvotes: 0

tanemaki
tanemaki

Reputation: 5069

How about this?

MyString0 = 'Hello'
MyString1 = 'Hello_'
MyString2 = 'Hello__'
MyString3 = 'Hello___'

f = lambda x : x.endswith(('_', '__')) and not x.endswith(('___'))

print f(MyString0) # --> False
print f(MyString1) # --> True
print f(MyString2) # --> True
print f(MyString3) # --> False

Upvotes: 0

mtadd
mtadd

Reputation: 2555

You can use regular expressions:

>>> re.match(".*[^_]__?$","test_")
<_sre.SRE_Match object; span=(0, 5), match='test_'>

>>> re.match(".*[^_]__?$","test__")
<_sre.SRE_Match object; span=(0, 6), match='test__'>

>>> re.match(".*[^_]__?$","test___")
None

Upvotes: 0

TheoretiCAL
TheoretiCAL

Reputation: 20581

If you cant make assumptions about the string length, a better way to check is

if len(myString)-len(myString.rstrip('_')) in (1,2):
    #do something

Upvotes: 1

karthikr
karthikr

Reputation: 99680

For Python version > 2.5,

You can use endswith with a tuple

underscores = ('_', '__')
if myString.endswith(underscores): pass

Demo

>>> underscores = ('_', '__')
>>> xx = "text__"
>>> xxx = "text_"
>>> xx.endswith(underscores)
True
>>> xxx.endswith(underscores)
True
>>>

Upvotes: 4

sshashank124
sshashank124

Reputation: 32197

If I understand you correctly, you can do that as:

if myString[-2:]=='__' or myString[-1] == '_':
    #do something

Upvotes: 1

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