Added Level 2 Excercises solutions

Author: zac11

Level2/Ex_10.py

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+"""
+Write a program that computes the value of a+aa+aaa+aaaa with a given digit as the value of a.
+Suppose the following input is supplied to the program:
+9
+Then, the output should be:
+11106
+"""
+
+number = input()
+
+n1 = int('%s'%number)
+print(n1)
+n2 = int('%s%s'%(number,number))
+print(n2)
+n3= int('%s%s%s'%(number,number,number))
+print(n3)
+n4= int('%s%s%s%s'%(number,number,number,number))
+print(n4)
+
+print(n1+n2+n3+n4)
+
+"""
+
+9
+99
+999
+9999
+11106
+
+"""

Level2/Ex_11.py

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+"""
+Use a list comprehension to square each odd number in a list. The list is input by a sequence of comma-separated numbers.
+Suppose the following input is supplied to the program:
+1,2,3,4,5,6,7,8,9
+Then, the output should be:
+1,3,5,7,9
+
+"""
+
+values = input()
+numbers = [x for x in values.split(',') if int(x)%2!=0]
+print(numbers)
+print(' '.join(numbers))

Level2/Ex_12.py

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+"""
+Question:
+Write a program that computes the net amount of a bank account based a transaction log from console input. The
+transaction log format is shown as following:
+D 100
+W 200
+¡­
+D means deposit while W means withdrawal.
+Suppose the following input is supplied to the program:
+D 300
+D 300
+W 200
+D 100
+Then, the output should be:
+500
+"""
+
+import sys
+netAccountAmount=0
+while True:
+    entry =input()
+    if not entry:
+        break
+    values = entry.split(',')
+    op = values[0]
+    newAmount = int(values[1])
+    if op =='D':
+        netAccountAmount+=newAmount
+    elif op =='W':
+        netAccountAmount-=newAmount
+    else:
+        pass
+
+print(netAccountAmount)

Level2/Ex_9.py

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+"""
+
+Write a program that accepts a sentence and calculate the number of upper case letters and lower case letters.
+Suppose the following input is supplied to the program:
+Hello world!
+Then, the output should be:
+UPPER CASE 1
+LOWER CASE 9
+
+"""
+
+input_string = input()
+dict_d ={'LOWECASE':0,'UPPERCASE':0}
+
+for items in input_string:
+    if items.isupper():
+        dict_d['UPPERCASE']+=1
+    elif items.islower():
+        dict_d['LOWECASE']+=1
+    else:
+        pass
+
+print('Lower case is ',dict_d['LOWECASE'])
+print('Upper case is ',dict_d['UPPERCASE'])
+
+"""
+Harambe is not dead. He is always in our hearts
+Lower case is  35
+Upper case is  2
+
+"""