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Author: hasitharathnayake

Using_Python_to_Access_Web_Data/Py4Inf-11-Regex-Guide.pdf

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+#The basic outline of this problem is to read the file, look for integers using
+#the re.findall(), looking for a regular expression of '[0-9]+' and then
+#converting the extracted strings to integers and summing up the integers.
+import re
+intl=list()
+
+fname=input("Please enter the file name: ")
+if len(fname)<1:#for ease of testing
+    fname="regex_sum_42.txt"
+
+#using a regex [0-9]+ isolates numbers in a line
+fhandle=open(fname)
+for lines in fhandle:
+    if re.search('[0-9]+',lines):
+        nums=re.findall('[0-9]+',lines)
+        for num in nums:
+            i=int(num)
+            intl.append(num)
+
+print(intl)
+print(sum(intl))