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The OR matches either the regex A or the regex B. sre = raw_input ('Enter a regular expression: ') fname = 'mbox.txt' try: fhand = open (fname) except: print 'File cannot be opened:', fname exit () lm = 0 for line in fhand: n = re.findall (sre, line) if len (n) > 0: lm = lm + 1 fhand.close () print fname, 'had', lm, 'lines that matched', sre.the CPython reference implementation uses that name internally). The construct's formal name is "Assignment Expressions" (as per the PEP title), but they may also be referred to as "Named Expressions" (e.g. During discussion of this PEP, the operator became informally known as "the walrus operator".Any function that manipulates string value returns a new string and we have to explicitly assign it to the string, otherwise, the string value won’t change. Python String is immutable, so we can’t change its value.
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Here you can learn how to initialize a string, get the string length, find a substring of it, trim white spaces of a string, convert the characters in string to upper and lower cases, replace a substring in the string, etc.
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These series of Python String Operations include examples for how to work with Strings in Python Programming. The regex Python package currently under development, backward compatible to re, and planned to replace re at some point, has this capability, so feel free to check it out if you are interested in this topic.
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The result is a regular expression that will match a string if a matches its first part and b matches the rest. No character represents this operator you simply put b after a.