5 March 2021

Author: FahimFBA

File/BadFileNames.py

@@ -0,0 +1,12 @@
+fname = input('Enter the file name:')
+try:
+ fhand = open(fname)
+except:
+ print('File cannot be opened:', fname)
+ quit()
+
+count = 0
+for line in fhand:
+ if line.startswith('Subject:'):
+ count = count + 1
+print('There were' , count, 'subject lines in', fname)

File/PromptFile.py

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+fname = input('Enter the file name: ')
+fhand = open(fname)
+count = 0
+for line in fhand:
+ if line.startswith('Subject:'):
+ count = count + 1
+print('There were' , count, 'subject lines in' , fname)

File/SearchingThroughAFile.py

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+fhand = open('a.txt')
+for line in fhand:
+ if line.startswith('From'):
+ print (line) 

File/SelectLines.py

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+# We can look for a string anywhere in a line as our selection criteria
+
+fhand = open('a.txt')
+for line in fhand:
+ line = line.rstrip()
+ if not '@uct.ac.za' in line:
+ continue
+ print (line)

File/a.txt

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+It will work as the first line
+It will work as the second line
+It will work as the third line
+It will work as the forth line
+It will work as the fifth line

File/countLine.py

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+fhand = open('a.txt')
+count = 0
+
+for i in fhand:
+ count += 1
+print('Line Count:' , count)

File/searching1.py

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+# Getting output without the whitespaces
+
+fhand = open('a.txt')
+for line in fhand:
+ line = line.rstrip()
+ if line.startswith('From:'):
+ print(line)
+
+# Skipping with continue
+
+fhand = open('a.txt')
+for line in fhand:
+ line = line.rstrip()
+ if not line.startswith('From:'):
+ continue
+ print(line)

File/test.txt

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+fhand = open('test.txt')
+print(fhand)
+
+# Output
+# <_io.TextIOWrapper name='test.txt' mode='r' encoding='cp1252'>

File/trial.py

@@ -0,0 +1,4 @@
+xfile = open('a.txt')
+
+for i in xfile:
+ print(i)