课程 \
Python3 入门教程（新版）
5-3 Python按索引访问list
# Enter a code
L = [95.5,85,59,66,72]
first_prinze=L[0]
second_prinze=L[1]
third_prize=L[4]
print(first_prinze,second_prinze,third_prize)
2022-07-26
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5-5 Python向list添加新的元素
# Enter a code
names=['Alice','Bob','Cindy','David','Ellena']
names.append('zero')
names.insert(5,'Phoebe')
names.insert(5,'Gen')
print(names)
2022-07-26
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5-7 Python替换list中的元素
# Enter a code
L=['Alice','Bob','Candy','David','Ellna']
L[0]='Ellena'
L[1]='Alice'
L[4]='Bob'
print(L)
2022-07-26
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5-8 Python二维list
L=[[1,2,3],[5,3,2],[7,3,2]]
for data in L:
length=data[0]
width=data[1]
height=data[2]
s=2*(length*height+length*width+height*width)
print(s)
2022-07-28
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6-2 访问tuple元素的其他方法
# Enter a code
T=(100,69,29,100,72,99,98,100,75,100,100,42,88,100)
print(T.count(100))
2022-07-27
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7-1 什么是dict
# Enter a code
d={
'alice':45,
'Bob':60,
'Candy':75,
'David':86,
'Ellena':49,
'Gaven':86
}
print(d)
2022-07-29
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7-2 Python读取dict元素
d = {
'Alice':45,
'Bob':60,
'Candy':75,
'David':86,
'Ellana':49
}
print(d.get('Alice'))
print(d.get('Bob'))
print(d.get('Candy'))
print(d.get('David'))
print(d.get('Ellana'))
2022-07-29
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7-3 Python添加dict元素
# Enter a coded=
d = {
'alice':[45],
'Bob':[60],
'Candy':[75],
}
d['alice']=[45,50,61,66]
d['Bob']=[60,80,61,66]
d['Candy']=[75,88,75,90]
print(d)
2022-07-30
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7-4 Python更新dict元素
# Enter a code
d = {
'Alice':45,
'Bob':60,
'Candy':75,
'David':86,
'Ellena':49
}
old_score=d.get('Alice')
print(old_score)
d['Alice']=60
print(d)
2022-07-30
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7-6 Python dict的特点
# Enter a code
d = {
1:True
}
key = (1,2,3)
d[key]=True
for key in d:
value=d[key]
print(key,value)
for k,v in d.items():
print(k,v)
d = {
'Alice':[50,61,66],
'Bob':[80,61,66],
'Candy':[85,75,90]
}
for key,value in d.items():
for score in value:
print(key,score)
2022-08-01
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7-7 Python操作dict的其他方法
# Enter a code
d = {
'Alice':[50,61,66],
'Bob':[80,61,66],
'Candy':[88,75,90]
}
keys=d.keys()
print(len(keys))
2022-08-01
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8-1 什么是set
# Enter a code
L = ['Alice','Bob','Candy','David','Ellena']
S = set(L)
print(S)
2022-08-01
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8-2 Python读取set元素
# Enter a code
names=['Alice','alice','Bob','Candy','David','Ellena']
name_set=set(names)
if 'bob' in name_set:
print('True')
else:
print('False')
2022-08-01
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8-3 Python添加set元素
# coding=utf-8
names = ['Jenny','Ellena','Alice','Candy','David','Hally','Bob']
S=set(names)
S.update(['Isen','Karl'])
print(S)
2022-08-05
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