Completed more exerecises

Author: andrese03

exercises/exercise-013.py

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+# Write a program that accepts a sentence and calculate the number of letters and digits.
+# Suppose the following input is supplied to the program:
+# hello world! 123
+# Then, the output should be:
+# LETTERS 10
+# DIGITS 3
+
+raw = input('Write something: ')
+stats = { 'digits': 0, 'letters': 0 }
+
+for char in raw:
+		if char.isdigit():
+				stats['digits']+=1
+		elif char.isalpha():
+				stats['letters']+=1
+		else:
+				pass
+
+print("LETTERS:", stats['letters'])
+print("NUMBERS:", stats['digits'])
+

exercises/exercise-014.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
+
+raw = input("Write something:")
+
+stats = { 'upper': 0, 'lower': 0 }
+
+for char in raw:
+	if char.isupper():
+		stats['upper'] += 1
+	elif char.islower():
+		stats['lower'] += 1
+	else:
+		pass
+
+print('UPPER: ', stats['upper'])
+print('LOWER: ', stats['lower'])
+

exercises/exercise-015.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
+
+raw = input('Write a number: ')
+
+a = int('%s' % (raw))
+aa = int('%s%s' % (raw, raw))
+aaa = int('%s%s%s' % (raw, raw, raw))
+aaaa = int('%s%s%s%s' % (raw, raw, raw, raw))
+
+print(a + aa + aaa + aaaa)

exercises/exercise-016.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
+
+raw = input('Write a serie of numbers: ')
+
+numbers = [i for i in raw.split(',') if int(i) % 2 != 0]
+
+print(','.join(numbers))

exercises/exercise-017.py

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+# 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
+
+amount = 0
+while True:
+	raw = input("Make a transaction: ")
+	if not raw:
+		break
+	args = raw.split(' ')
+	operation = args[0]
+	value = float(args[1])
+	if operation is 'D':
+		amount += value
+	elif operation is 'W':
+		amount -= value
+	else:
+		pass
+
+print('Total amount:', amount)

exercises/exercise-018.py

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+# A website requires the users to input username and password to register. Write a program to check the validity of password input by users.
+# Following are the criteria for checking the password:
+# 1. At least 1 letter between [a-z]
+# 2. At least 1 number between [0-9]
+# 1. At least 1 letter between [A-Z]
+# 3. At least 1 character from [$#@]
+# 4. Minimum length of transaction password: 6
+# 5. Maximum length of transaction password: 12
+# Your program should accept a sequence of comma separated passwords and will check them according to the above criteria. Passwords that match the criteria are to be printed, each separated by a comma.
+# Example
+# If the following passwords are given as input to the program:
+# ABd1234@1,a F1#,2w3E*,2We3345
+# Then, the output of the program should be:
+# ABd1234@1