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I have a RNA sequence of varying length. Max length of the sequence is 22. Some sequences are shorter. So if a sequence is shorter then add "0" to the end of the line till the length becomes 22.
How to do it in python? this is my input
AAGAUGUGGAAAAAUUGGAAUC
CAGUGGUUUUAUGGUAG
CUCUAGAGGGUUUCUG
UUCAUUCGGC
and my expected ouput should be for example in the last line it does not contain 22 characters so i need to make it 22 by adding zero to it
UUCAUUCGGC000000000000
but as per your commands i am getting out put as AAGAUGUGGAAAAAUU 00000 the addtional characters used for justification came down and not in the same line
585
Use the == and != operators to compare two strings for equality. Use the is operator to check if two strings are the same instance.
In Python, strings have a built-in method named ljust . The method lets you pad a string with characters up to a certain length. The ljust method means "left-justify"; this makes sense because your string will be to the left after adjustment up to the specified length.
Python comparison operators can be used to compare strings in Python. These operators are: equal to ( == ), not equal to ( != ), greater than ( > ), less than ( < ), less than or equal to ( <= ), and greater than or equal to ( >= ).
Use syntax string[x:y] to slice a string starting from index x up to but not including the character at index y. If you want only to cut the string to length in python use only string[: length].
Use str.ljust method:
>>> s = 'foobar'
>>> s.ljust(22, '0')
'foobar0000000000000000'
An alternative to @Aशwini चhaudhary's answer is:
s = '{0:0<22}'.format(s)
s = 'hello'
s = '{0:0<22}'.format(s)
>>> print s
hello00000000000000000
Or as शwini चhaudhary suggested, simply:
s = format(s, '0<22')
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