Updated lecture code 11/4/2025

bigos/lecture20251104/csvfiles/csvline1.py

@@ -1,9 +1,11 @@
+import sys
 
 line = "7/5/2016,123,638.5"
 
 # split line on commas
 lineFields = line.split(',')
 
+print(line)
 print(lineFields)
 
 

bigos/lecture20251104/csvfiles/demofile2.txt

@@ -0,0 +1,7 @@
+Now the file has more content!Now the file has more content!Now the file has more content!
+Now the file has more content!
+Now the file has more content!
+Now the file has more content!
+Now the file has more content!
+Now the file has more content!
+Now the file has more content!

bigos/lecture20251104/csvfiles/filereadwrite01.py

@@ -1,7 +1,7 @@
 # https://www.w3schools.com/python/python_file_write.asp
 
 f = open("demofile2.txt", "a")
-f.write("Now the file has more content!")
+f.write("Now the file has more content!\n")
 f.close()
 
 #open and read the file after the appending:

bigos/lecture20251104/csvfiles/hack.py

@@ -0,0 +1,24 @@
+# Read a csv file from the current directory
+# import the csv function library
+import csv
+
+filename = "data.csv"
+
+with open(filename,'r') as csvfile:
+    csvData = csv.reader(csvfile,delimiter = ',',quotechar = '"')
+
+    AvgDuration = 0
+    AvgPulse = 0
+    rowCounter = 0
+    for row in csvData:
+
+        if rowCounter != 0:
+            AvgDuration = (AvgDuration + float(row[0]) ) /2
+            AvgPulse = (AvgPulse + float(row[1]) )/2
+#        print(row, AvgDuration, AvgPulse)
+        rowCounter = rowCounter + 1
+
+print(f"Average Duration = {AvgDuration:.1f}")
+print(f"Average Pulse = {AvgPulse:.0f}")
+
+

bigos/lecture20251104/fileio_census/fileread01.py

@@ -4,7 +4,7 @@
 # for more information
 # Just try reading it line by line on the first attempt.
 
-fileName = "testdata.txt"
+fileName = "testxdata.txt"
 try:
     inFile = open(fileName,'r')
 
@@ -18,8 +18,8 @@ try:
         line = line.rstrip("\n")
         count = count + 1
 
-except:
-    print("Some error occurred. Ending here")
+except Exception as e:
+    print("Some error occurred. Ending here",e)
     exit(-1)
 
 inFile.close()

bigos/lecture20251104/powerball/pandasreadcsv01.py

@@ -0,0 +1,7 @@
+# https://www.w3schools.com/python/pandas/pandas_csv.asp
+
+import pandas as pd
+
+df = pd.read_csv('powerball.csv')
+
+print(df.to_string()) 

bigos/lecture20251104/powerball/pandasreadcsv02.py

@@ -0,0 +1,9 @@
+# https://www.w3schools.com/python/pandas/pandas_csv.asp
+
+import pandas as pd
+
+df = pd.read_csv('powerball.csv')
+
+print(df.head())
+
+print(df.tail())

bigos/lecture20251104/z-links.txt

@@ -1,4 +1,5 @@
 # https://www.w3schools.io/file/csv-extension-introduction/
 
+# Visualize Python https://pythontutor.com/visualize.html#mode=edit