for 循环

Python 中级

Hugo Bowne-Anderson

Data Scientist at DataCamp

for 循环

for var in seq :
    expression
  • "对 seq 中的每个 var，执行 expression"
Python 中级

fam

family.py

fam = [1.73, 1.68, 1.71, 1.89]

print(fam)

[1.73, 1.68, 1.71, 1.89]
Python 中级

fam

family.py

fam = [1.73, 1.68, 1.71, 1.89]
print(fam[0])
print(fam[1])
print(fam[2])
print(fam[3])

1.73
1.68
1.71
1.89
Python 中级

for 循环

for var in seq :
    expression

family.py

fam = [1.73, 1.68, 1.71, 1.89]
for height in fam : 
    print(height)
Python 中级

for 循环

for var in seq :
    expression

family.py

fam = [1.73, 1.68, 1.71, 1.89]
for height in fam : 
    print(height)
    # 第一次迭代
    # height = 1.73

1.73
Python 中级

for 循环

for var in seq :
    expression

family.py

fam = [1.73, 1.68, 1.71, 1.89]
for height in fam : 
    print(height)
    # 第二次迭代
    # height = 1.68

1.73
1.68
Python 中级

for 循环

for var in seq :
    expression

family.py

fam = [1.73, 1.68, 1.71, 1.89]
for height in fam : 
    print(height)

1.73
1.68
1.71
1.89
  • 不能直接访问索引
Python 中级

for 循环

for var in seq :
    expression

family.py

fam = [1.73, 1.68, 1.71, 1.89]
  • ???
index 0: 1.73
index 1: 1.68
index 2: 1.71
index 3: 1.89
Python 中级

enumerate

for var in seq :
    expression

family.py

fam = [1.73, 1.68, 1.71, 1.89]

for index, height in enumerate(fam) :
    print("index " + str(index) + ": " + str(height))

index 0: 1.73
index 1: 1.68
index 2: 1.71
index 3: 1.89
Python 中级

遍历字符串

for var in seq :
    expression

strloop.py

for c in "family" :
    print(c.capitalize())

F
A
M
I
L
Y
Python 中级

Passons à la pratique !

Python 中级

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