updatingch_8 and Ch_7

ssoehdata · ssoehdata · commit cc73b5d4b286 · 2024-05-17T22:01:43.000+02:00
diff --git a/Python4Everybody/Ch_7_Files/countline.py b/Python4Everybody/Ch_7_Files/countline.py
@@ -0,0 +1,8 @@
+# counting lines in a file
+
+# example
+fhand = open('mbox.txt')
+count = 0
+for line in fhand:
+    count = count + 1
+print('Line Count:', count)
diff --git a/Python4Everybody/Ch_7_Files/filenameprmpt.py b/Python4Everybody/Ch_7_Files/filenameprmpt.py
@@ -0,0 +1,32 @@
+# prompt user for file name
+
+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)
+
+
+# example output:
+# enter the filen name: mbox.txt
+# there were 1797 subject lines in mbox.txt
+
+# Enter the the file name: mbox-short.txt
+# There were 27 subject lines in mbox-short.txt
+
+# add a try except to the above to handle bad filename input
+
+fname = input('Enter the file name:  ')
+try:                # added a try / except block where danger point is (filename input)
+    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)
diff --git a/Python4Everybody/Ch_7_Files/newline.py b/Python4Everybody/Ch_7_Files/newline.py
@@ -0,0 +1,17 @@
+# newline character 
+# indicates when a line ends
+# \n
+
+# n.b.: 'print' adds an additional \n at the end. (you can override this behaviour)
+stuff = 'Hello\nWorld!'
+print(stuff)
+
+stuff2 = 'X\nY'
+print(stuff2)
+print(len(stuff))
+print(len(stuff2))  # this gives 3 characters because the \n is also a character
+
+
+# a text file has a newline \n at the end of each line
+#texttexttextn\
+#texttexttexttexttextn\
diff --git a/Python4Everybody/Ch_7_Files/newlineseq.py b/Python4Everybody/Ch_7_Files/newlineseq.py
@@ -0,0 +1,14 @@
+# file handle as a sequence
+
+# a file handle open for read can be treated as a sequence
+# of strings where each line in he file is a
+# string in the sequence.
+
+# we can use a for statement to iterate through a sequence
+
+# remember a sequence is an ordered set
+
+xfile = open('mbox.txt')
+for cheese in xfile:     # cheese is an iteration var for the for loop here
+    print(cheese)           # ' for each line (cheese) in the the filehandle 'xfile'
+                            # 'run this loop 1x, then print it' 
diff --git a/Python4Everybody/Ch_7_Files/open.py b/Python4Everybody/Ch_7_Files/open.py
@@ -0,0 +1,11 @@
+# open() function
+# makes it possible to read the file
+# it returns a file handle (a variable) used to perform operations on the file
+
+# handle = open(filename, mode) - takes atleast one parameter(name of file)
+# additional parameters are optional (e.g. mode / 'r' for read, 'w' for write etc)
+
+# handle is a thing that allows you to get to the file
+#example: 
+# fhand = open('mbox.txt')
+# print(fhand)
diff --git a/Python4Everybody/Ch_7_Files/skipin.py b/Python4Everybody/Ch_7_Files/skipin.py
@@ -0,0 +1,11 @@
+# using 'in' operater to select lines
+
+# can look for a string anywhere in a line as our selection criteria
+
+fhand = open('mbox-short.txt')
+for line in fhand:
+    line = line.rstrip()
+    if not '@uct.ac.za' in line:
+        continue
+    print(line)
+
diff --git a/Python4Everybody/Ch_8_Lists/Assignments/assignment1.py b/Python4Everybody/Ch_8_Lists/Assignments/assignment1.py
@@ -0,0 +1,23 @@
+# for assignment:
+
+# [x] Open the file romeo.txt and read it line by line. 
+# [x] For each line, split the line into a list of words using the split() method. 
+# [] The program should build a list of words. 
+# [x] For each word on each line check to see 
+#   if the word is already in the list and 
+# [x] if not append it to the list. 
+# [x] When the program completes, sort and print the resulting words 
+
+
+new_list = []
+fname = input('Enter file name to open:  ')
+fhand = open(fname)
+
+for line in fhand:
+    words = line.split()        #separate words into items in list
+    for word in words: 
+        if word in new_list:
+            continue            # account for (ignore) duplicate words
+        new_list.append(word)   # adds new words to list
+print(sorted(new_list))         # sorts and prints the final list 
+                                # of unique words in the text
diff --git a/Python4Everybody/Ch_8_Lists/Assignments/mbox-short.txt b/Python4Everybody/Ch_8_Lists/Assignments/mbox-short.txt
diff --git a/Python4Everybody/Ch_8_Lists/Assignments/romeo.txt b/Python4Everybody/Ch_8_Lists/Assignments/romeo.txt
diff --git a/Python4Everybody/Ch_8_Lists/guardian.py b/Python4Everybody/Ch_8_Lists/guardian.py
