chanllenge 1

Author: zhiwehu

.gitignore

@@ -0,0 +1,140 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+.idea

001_1_minute_math.md

@@ -0,0 +1,184 @@
+# 1 minute math
+
+## Requirements
+
+1. Run the code in console using command line.
+2. It'll run for 1 minute.
+3. For every time it'll show 2 random numbers and random arithmetic operations such as add, subtract, multiply and divide. If the operation is divide then the divisor can not be 0.
+4. It'll judge if your answer is correct or not, then show next question.
+5. When time is up it'll show how many questions you answered and show the correct rate for total questions.
+
+## What will we practice in this project?
+
+- format print
+- while loop
+- if condition
+- list
+- exception handle
+- function
+- time package
+- random package
+
+## A reference code
+
+```python
+import time
+import random
+
+
+def get_divisor(n):
+    '''
+    Get a random divisor of n.
+    :param n: The number
+    :return: a divisor of n
+    '''
+    l = []
+    for i in range(1, n + 1):
+        if n % i == 0:
+            l.append(i)
+    return random.choice(l)
+
+
+if __name__ =='__main__':
+    ops = ['+', '-', '*', '/']
+    start_time = time.time()
+    total = 0
+    correct = 0
+    questions = []
+    # while seconds is less than 60
+    while time.time() - start_time <= 60:
+        a = random.randint(1, 99)
+        op = random.choice(ops)
+        if op == '/':
+            # if op is '/' then b is a divisor of a
+            b = get_divisor(a)
+        else:
+            b = random.randint(1, 99)
+        # Get the correct answer
+        a_op_b = '{}{}{}'.format(a, op, b)
+        c = int(eval(a_op_b))
+
+        # Let user input answer
+        try:
+            ans = int(input('{} = '.format(a_op_b)))
+        except:
+            ans = ''
+		
+        # To check if correct or not
+        if time.time() - start_time <= 60: 
+            if c == ans:
+                print('Correct! Time remain {} seconds.'.format(int(60 - (time.time() - start_time))))
+                correct = correct + 1
+            else:
+                print('Wrong answer! Time remain {} seconds.'.format(int(60 - (time.time() - start_time))))
+            total = total + 1
+            questions.append('{}={}'.format(a_op_b, ans))
+
+    print('{} questions and your correct rate is {:.2f}%'.format(total, correct / total * 100))
+    for q in questions:
+        print(q)
+
+```
+
+## Run the demo
+
+Please save the Python as 1.py and run it in console：
+
+```
+python 1.py
+```
+
+![Chanllenge 1](images/challenge1_1.png)
+
+----
+
+# 1分钟数学运算
+
+## 项目需求
+
+- 直接在控制台使用命令行运行
+- 程序运行之后倒计时1分钟之后结束
+- 随机出100以内的2个整数加减乘除运算题目（除法确保能够除尽，但除数不能为0）
+- 每出一道题目，由玩家给出答案，然后程序判断对错，接着出下一题，并且显示剩余时间
+- 1分钟时间结束，显示总题数和正确率（正确率精确到小数点后2位），并将之前的题目和答案显示出来
+
+## 项目练习
+
+- 格式化字符串输出
+- 循环
+- 条件判断
+- 列表
+- 异常处理
+- 自定义函数
+- 时间工具包
+- 随机工具包
+
+## 项目参考代码
+
+```python
+import time
+import random
+
+
+def get_divisor(n):
+    '''
+    随机获得一个数n的整数除数。
+    :param n: 一个整数
+    :return: 一个数n的整数除数
+    '''
+    l = []
+    for i in range(1, n + 1):
+        if n % i == 0:
+            l.append(i)
+    return random.choice(l)
+
+
+if __name__ =='__main__':
+    ops = ['+', '-', '*', '/']
+    start_time = time.time()
+    total = 0
+    correct = 0
+    questions = []
+    while time.time() - start_time <= 60:
+        a = random.randint(1, 99)
+        op = random.choice(ops)
+        if op == '/':
+            # 如果是除法，b为a的一个随机整数除数
+            b = get_divisor(a)
+        else:
+            b = random.randint(1, 99)
+        # 正确答案
+        a_op_b = '{}{}{}'.format(a, op, b)
+        c = int(eval(a_op_b))
+
+        # 让用户输入答案
+        try:
+            ans = int(input('{} = '.format(a_op_b)))
+        except:
+            ans = ''
+
+        # 检查是否正确
+        if time.time() - start_time <= 60:
+            if c == ans:
+                print('正确！剩余时间{}秒。'.format(int(60 - (time.time() - start_time))))
+                correct = correct + 1
+            else:
+                print('错误！剩余时间{}秒。'.format(int(60 - (time.time() - start_time))))
+            total = total + 1
+            questions.append('{}={}'.format(a_op_b, ans))
+
+    print('{}道题目，正确率 {:.2f}%。'.format(total, correct / total * 100))
+    for q in questions:
+        print(q)
+
+```
+
+## 测试运行
+
+将代码保存为1.py，然后在控制台运行：
+
+```
+python 1.py
+```
+
+![挑战1](images/challenge1_1.png)

code/1/1.py

@@ -0,0 +1,55 @@
+import time
+import random
+
+
+def get_divisor(n):
+    '''
+    Get a random divisor of n.
+    :param n: The number
+    :return: a divisor of n
+    '''
+    l = []
+    for i in range(1, n + 1):
+        if n % i == 0:
+            l.append(i)
+    return random.choice(l)
+
+
+if __name__ == '__main__':
+    ops = ['+', '-', '*', '/']
+    start_time = time.time()
+    total = 0
+    correct = 0
+    questions = []
+    # while seconds is less than 60
+    while time.time() - start_time <= 60:
+        a = random.randint(1, 99)
+        op = random.choice(ops)
+        if op == '/':
+            # if op is '/' then b is a divisor of a
+            b = get_divisor(a)
+        else:
+            b = random.randint(1, 99)
+        # Get the correct answer
+        a_op_b = '{}{}{}'.format(a, op, b)
+        c = int(eval(a_op_b))
+
+        # Let user input answer
+        try:
+            ans = int(input('{} = '.format(a_op_b)))
+        except:
+            ans = ''
+
+        # To check if correct or not
+        if time.time() - start_time <= 60:
+            if c == ans:
+                print('Correct! Time remain {} seconds.'.format(int(60 - (time.time() - start_time))))
+                correct = correct + 1
+            else:
+                print('Wrong answer! Time remain {} seconds.'.format(int(60 - (time.time() - start_time))))
+            total = total + 1
+            questions.append('{}={}'.format(a_op_b, ans))
+
+    print('{} questions and your correct rate is {:.2f}%'.format(total, correct / total * 100))
+    for q in questions:
+        print(q)