Merge pull request #500 from realpython/python-keyboard-input

Materials for user input tutorial

python-keyboard-input/README.md

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+# How to Read User Input From the Keyboard in Python
+
+This folder provides the code examples for the Real Python tutorial [How to Read User Input From the Keyboard in Python](https://realpython.com/python-keyboard-input/).

python-keyboard-input/banking_app.py

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+import pyinputplus as pyip
+
+account_balance = 1000
+
+print("Welcome to REALBank.")
+while True:
+    print(f"\nYour account balance: ${account_balance}")
+    transaction_type = pyip.inputChoice(["Deposit", "Withdraw", "Exit"])
+
+    if transaction_type == "Exit":
+        break
+    elif transaction_type == "Deposit":
+        deposit_amount = pyip.inputInt(
+            prompt="Enter amount (max $10,000): $", min=0, max=10000
+        )
+        account_balance += deposit_amount
+        print(f"Deposited ${deposit_amount}.")
+    elif transaction_type == "Withdraw":
+        withdrawal_amount = pyip.inputInt(
+            prompt="Enter amount: $", min=0, max=account_balance
+        )
+        account_balance -= withdrawal_amount
+        print(f"Withdrew ${withdrawal_amount}.")
+
+print("\nThank you for choosing REALBank. We hope to see you again soon!")

python-keyboard-input/inputplus.py

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+import pyinputplus as pyip
+
+age = pyip.inputInt(prompt="Enter your age: ", min=0, max=120)
+print(f"Your age is: {age}")

python-keyboard-input/integer_input.py

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+while True:
+    try:
+        age = int(input("How old are you? "))
+    except ValueError:
+        print("Please enter a number for your age.")
+    else:
+        break
+print(f"Next year, you'll be {age + 1} years old")

python-keyboard-input/list_input.py

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+user_colors = input("Enter the three secondary colors separated by commas: ")
+colors = [s.strip() for s in user_colors.split(",")]
+
+print(f"List of colors: {colors}")

python-keyboard-input/multiple_inputs.py

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+print("Name at least 3 colors in the Kenyan flag.")
+
+kenya_flag_colors = {"green", "black", "red", "white"}
+user_colors = set()
+
+while len(user_colors) < 3:
+    color = input("Enter a color on the Kenya flag: ")
+    user_colors.add(color.lower())
+
+if user_colors.issubset(kenya_flag_colors):
+    print(
+        "Correct! These colors are all in the Kenyan flag: "
+        + ", ".join(user_colors)
+    )
+else:
+    print(
+        "Incorrect. The colors of the Kenyan flag are: "
+        + ", ".join(kenya_flag_colors)
+    )

python-keyboard-input/quiz.py

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+questions = {
+    "What are the four colors of the Kenyan flag? ": {
+        "green",
+        "black",
+        "red",
+        "white",
+    },
+    "What are the three colors of the French flag? ": {"blue", "red", "white"},
+    "How do you spell the first three numbers in Norwegian? ": {
+        "en",
+        "to",
+        "tre",
+    },
+}
+
+for question, correct in questions.items():
+    while True:
+        answers = {
+            answer.strip().lower() for answer in input(question).split(",")
+        }
+        if len(answers) == len(correct):
+            break
+        print(f"Please enter {len(correct)} answers separated by comma")
+    if answers == correct:
+        print("Correct")
+    else:
+        print(f"No, the correct answer is {', '.join(correct)}")

python-keyboard-input/sensitive.py

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+import os
+import getpass
+
+
+def verify_email(email):
+    allowed_emails = [
+        email.strip() for email in os.getenv("ALLOWED_EMAILS").split(",")
+    ]
+    return email in allowed_emails
+
+
+def main():
+    email = getpass.getpass("Enter your email address: ")
+    if verify_email(email):
+        print("Email is valid. You can proceed.")
+    else:
+        print("Incorrect email. Access denied.")
+
+
+if __name__ == "__main__":
+    main()