Python 入门教程 10 ---- Student Becomes the Teache

作者:北京诚信汇发物流有限公司  来源:www.cxhfwL.com  发布时间:2017-09-12 16:32:41
Python 入门教程 10 ---- Student Becomes the Teacher 第一节

1 练习

1 设置三个的字典分别为lloyd,alice,tyler

2 对每一个的字典的key都设置为"name","homework" , "quizzes", "tests"

3 每个字典的key为"name"对应的为人的名字,其他key对应的值为空列表

[python]

# three dictionaries

lloyd = {"name":"Lloyd" , "homework":[] , "quizzes":[] , "tests":[]}

alice = {"name":"Alice" , "homework":[] , "quizzes":[] , "tests":[]}

tyler = {"name":"Tyler" , "homework":[] , "quizzes":[] , "tests":[]}

第二节

1 练习:把第一个字典lloyd中的三个空列表的值设置对应如下

Homework: 90.0, 97.0, 75.0, 92.0

Quizzes: 88.0, 40.0, 94.0

Test Scores: 75.0, 90.0

[python]

lloyd = {

"name": "Lloyd",

"homework": [90.0, 97.0, 75.0, 92.0],

"quizzes": [88.0, 40.0, 94.0],

"tests": [75.0, 90.0]

}

alice = {

"name": "Alice",

"homework": [100.0, 92.0, 98.0, 100.0],

"quizzes": [82.0, 83.0, 91.0],

"tests": [89.0, 97.0]

}

tyler = {

"name": "Tyler",

"homework": [0.0, 87.0, 75.0, 22.0],

"quizzes": [0.0, 75.0, 78.0],

"tests": [100.0, 100.0]

}

第三节

1 练习:把lloyd , alice , tyler三个字典放到列表students中

[python]

lloyd = {

"name": "Lloyd",

"homework": [90.0, 97.0, 75.0, 92.0],

"quizzes": [88.0, 40.0, 94.0],

"tests": [75.0, 90.0]

}

alice = {

"name": "Alice",

"homework": [100.0, 92.0, 98.0, 100.0],

"quizzes": [82.0, 83.0, 91.0],

"tests": [89.0, 97.0]

}

tyler = {

"name": "Tyler",

"homework": [0.0, 87.0, 75.0, 22.0],

"quizzes": [0.0, 75.0, 78.0],

"tests": [100.0, 100.0]

}

# you code here

students = [lloyd , alice , tyler]

第四节

1 练习:按照以下的格式,打印出students列表中的三个字典

[python]

Lloyd

[90, 97, 75, 92]

[88, 40, 94]

[75, 90]<span style="font-family:Arial,Helvetica,sans-serif"> </span>

[python] view plaincopy

lloyd = {

"name": "Lloyd",

"homework": [90.0, 97.0, 75.0, 92.0],

"quizzes": [88.0, 40.0, 94.0],

"tests": [75.0, 90.0]

}

alice = {

"name": "Alice",

"homework": [100.0, 92.0, 98.0, 100.0],

"quizzes": [82.0, 83.0, 91.0],

"tests": [89.0, 97.0]

}

tyler = {

"name": "Tyler",

"homework": [0.0, 87.0, 75.0, 22.0],

"quizzes": [0.0, 75.0, 78.0],

"tests": [100.0, 100.0]

}

# you code here

students = [lloyd , alice , tyler]

# you code hrre

for my_list in students:

for str in my_list:

print my_list[str]

第五节

1 练习

1 对于每一个数字列表,我们可以求其平均值,比如 average([0]) #0.0,average([0,2]) #1.0,专题系统,average([0,1]) #0.5

2 写一个函数average,参数是列表lst,求其平均值并以float形式输出

[python]

lloyd = {

"name": "Lloyd",

"homework": [90.0, 97.0, 75.0, 92.0],

"quizzes": [88.0, 40.0, 94.0],

"tests": [75.0, 90.0]

}

alice = {

"name": "Alice",

"homework": [100.0, 92.0, 98.0, 100.0],

"quizzes": [82.0, 83.0, 91.0],

"tests": [89.0, 97.0]

}

tyler = {

"name": "Tyler",

"homework": [0.0, 87.0, 75.0, 22.0],

"quizzes": [0.0, 75.0, 78.0],

"tests": [100.0, 100.0]

}

# Add your function below!

def average(lst):

sum = 0

for num in lst:

sum = sum+num

return float(sum)/len(lst)

第六节

1 介绍了我们经常需要去求很多数的平均值,比如80 * 0.4 + 86 * 0.6

2 练习:写一个函数get_average,参数是一个学生字典,使用如下比例Homework 10%, quizzes 30% tests60%算出这个学生的平均得分

[python]

lloyd = {

"name": "Lloyd",

"homework": [90.0, 97.0, 75.0, 92.0],

"quizzes": [88.0, 40.0, 94.0],

"tests": [75.0, 90.0]

}

alice = {

"name": "Alice",

"homework": [100.0, 92.0, 98.0, 100.0],

"quizzes": [82.0, 83.0, 91.0],

"tests": [89.0, 97.0]

}

tyler = {

"name": "Tyler",

"homework": [0.0, 87.0, 75.0, 22.0],

"quizzes": [0.0, 75.0, 78.0],

"tests": [100.0, 100.0]

}

# Add your function below!

def average(lst):

sum = 0

for num in lst:

sum = sum+num

return float(sum)/len(lst)

# function get_average

def get_average(stu):

return 0.1*average(stu["homework"])+0.3*average(stu["quizzes"])+0.6*average(stu["tests"])

第七节

1 练习

1 写一个函数get_letter_grade,参数是score,可视化专题,按照以下的规则返回对应的等级

[python]

Scores 90 or above: return "A"

If 80 <= score < 90: return "B"

If 70 <= score < 80: return "C"

If 60 <= score < 70: return "D"

If score < 60: return "F"

[python]

lloyd = {

"name": "Lloyd",

"homework": [90.0, 97.0, 75.0, 92.0],

"quizzes": [88.0, 40.0, 94.0],

"tests": [75.0, 90.0]

}

alice = {

"name": "Alice",

"homework": [100.0, 92.0, 98.0, 100.0],

"quizzes": [82.0, 83.0, 91.0],

"tests": [89.0, 97.0]

}

tyler = {

"name": "Tyler",

"homework": [0.0, 87.0, 75.0, 22.0],

"quizzes": [0.0, 75.0, 78.0],

"tests": [100.0, 100.0]

}

# Add your function below!

def average(lst):

sum = 0

for num in lst:

sum = sum+num

return float(sum)/len(lst)

# function get_average

def get_average(stu):

return 0.1*average(stu["homework"])+0.3*average(stu["quizzes"])+0.6*average(stu["tests"])

# function get_letter_grade

def get_letter_grade(score):

if(score >= 90):

return "A"

elif(score >= 80 and score < 90):

return "B"

elif(score >= 70 and score < 80):

return "C"

elif(score >= 60 and score < 70):

return "D"

else:

return "F"

第八节

1 练习:写一个函数get_class_average,参数是班级的列表,求出这个班级所有人的平均值

[python]

lloyd = {

"name": "Lloyd",

"homework": [90.0, 97.0, 75.0, 92.0],

"quizzes": [88.0, 40.0, 94.0],

"tests": [75.0, 90.0]

}

alice = {

"name": "Alice",

"homework": [100.0, 92.0, 98.0, 100.0],

"quizzes": [82.0, 83.0, 91.0],

"tests": [89.0, 97.0]

}

tyler = {

"name": "Tyler",

"homework": [0.0, 87.0, 75.0, 22.0],

"quizzes": [0.0, 75.0, 78.0],

"tests": [100.0, 100.0]

}

# Add your function below!

def average(lst):

sum = 0

for num in lst:

sum = sum+num

return float(sum)/len(lst)

# function get_average

def get_average(stu):

return 0.1*average(stu["homework"])+0.3*average(stu["quizzes"])+0.6*average(stu["tests"])

# function get_letter_grade

def get_letter_grade(score):

if(score >= 90):

return "A"

elif(score >= 80 and score < 90):

return "B"

elif(score >= 70 and score < 80):

return "C"

elif(score >= 60 and score < 70):

return "D"

else:

return "F"

# function get_class_average

def get_class_average(class_list):

sum = 0

for stu in class_list:

sum = sum + get_average(stu)

return float(sum)/len(class_list)

第十节

1 练习:打印出students这个班级列表的平均值,然后利用这个值求平均等级

[python]

lloyd = {

"name": "Lloyd",

"homework": [90.0, 97.0, 75.0, 92.0],

"quizzes": [88.0, 40.0, 94.0],

"tests": [75.0, 90.0]

}

alice = {

"name": "Alice",

"homework": [100.0, 92.0, 98.0, 100.0],

"quizzes": [82.0, 83.0, 91.0],

"tests": [89.0, 97.0]

}

tyler = {

"name": "Tyler",

"homework": [0.0, 87.0, 75.0, 22.0],

"quizzes": [0.0, 75.0, 78.0],

"tests": [100.0, 100.0]

}

# students list

students = [lloyd , alice , tyler]

# Add your function below!

def average(lst):

sum = 0

for num in lst:

sum = sum+num

return float(sum)/len(lst)

# function get_average

def get_average(stu):

return 0.1*average(stu["homework"])+0.3*average(stu["quizzes"])+0.6*average(stu["tests"])

# function get_letter_grade

def get_letter_grade(score):

if(score >= 90):

return "A"

elif(score >= 80 and score < 90):

return "B"

elif(score >= 70 and score < 80):

return "C"

elif(score >= 60 and score < 70):

return "D"

else:

return "F"

# function get_class_average

def get_class_average(class_list):

sum = 0

for stu in class_list:

sum = sum + get_average(stu)

return float(sum)/len(class_list)

# print you result

score = get_class_average(students)

print score

print get_letter_grade(score

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