session5

Introduction-to-Data-Science/Session-5/aakash_singh/q3.py

@@ -0,0 +1,11 @@
+try:
+    n=int(input('enter a number: '))
+except ValueError:
+    print('please try again and input a number')
+    exit()
+
+try:
+    print(100/n)
+except ZeroDivisionError:
+    print('cant divide by zero')
+    exit()

Introduction-to-Data-Science/Session-5/aakash_singh/q4.py

@@ -0,0 +1,12 @@
+import sys
+
+try:
+    file = open(sys.argv[1],'r')
+except:
+    print('file doesnt exist')
+    exit()
+
+lines=file.read().split('\n')
+file.close()
+for line in lines[::-1]:
+    print(line.strip())

Introduction-to-Data-Science/Session-5/aakash_singh/theory.txt

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+q1:
+    ab+ mode expands to append binary read and write.
+    The file at default opens with cursor at EOF in binary mode and can be read or written to.
+
+q2.
+    buffering means that python is not directly interfacing with the OS's representation of a file or its file system.
+    Instead only a chunk of data is read from the raw OS filestream into a buffer.