From f482a64d4b9364c0e756bc923c95268f584b206d Mon Sep 17 00:00:00 2001
From: Aakash Singh <17aakashsingh1999@gmail.com>
Date: Tue, 29 May 2018 16:39:58 +0530
Subject: [PATCH] session5

---
 .../Session-5/aakash_singh/q3.py                     | 11 +++++++++++
 .../Session-5/aakash_singh/q4.py                     | 12 ++++++++++++
 .../Session-5/aakash_singh/theory.txt                |  7 +++++++
 3 files changed, 30 insertions(+)
 create mode 100644 Introduction-to-Data-Science/Session-5/aakash_singh/q3.py
 create mode 100644 Introduction-to-Data-Science/Session-5/aakash_singh/q4.py
 create mode 100644 Introduction-to-Data-Science/Session-5/aakash_singh/theory.txt

diff --git a/Introduction-to-Data-Science/Session-5/aakash_singh/q3.py b/Introduction-to-Data-Science/Session-5/aakash_singh/q3.py
new file mode 100644
index 0000000..400198c
--- /dev/null
+++ b/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()
\ No newline at end of file
diff --git a/Introduction-to-Data-Science/Session-5/aakash_singh/q4.py b/Introduction-to-Data-Science/Session-5/aakash_singh/q4.py
new file mode 100644
index 0000000..2b0bac2
--- /dev/null
+++ b/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())
\ No newline at end of file
diff --git a/Introduction-to-Data-Science/Session-5/aakash_singh/theory.txt b/Introduction-to-Data-Science/Session-5/aakash_singh/theory.txt
new file mode 100644
index 0000000..bf81f1e
--- /dev/null
+++ b/Introduction-to-Data-Science/Session-5/aakash_singh/theory.txt
@@ -0,0 +1,7 @@
+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.
\ No newline at end of file