DAY 02 - 串列 & For迴圈

tags: python教學 for loop range() split

串列

student = ["alan" , "jack" , "rose" , "bonny", "stan"]

串列+For迴圈

student = ["alan" , "jack" , "rose" , "bonny", "stan"]
for name in student:
  print(name)

輸出結果

alan
jack
rose
bonny
stan

---

for in range

for number in range(1,10):# 1<=number<10 1~9
  print(number)

輸出結果

1
2
3
4
5
6
7
8
9

---

奇數

for number in range(1,10,2):
  print(number)

輸出結果

1
3
5
7
9

---

range()建立數字串列

因為range()是一個函數 所以要用list括號起來 轉換成串列

odd_number = list(range(1,10,2))
print(odd_number)

輸出結果

[1,3,5,7,9]

擷取串列中的某部分

i <= x < j

print(student[0:3]) #印出索引足標0,1,2對應的元素
print(student[1:4]) #印出索引足標1,2,3對應的元素
print(studnet[:2]) #印出從索引足標0到1的元素
print(student[2:]) #印出從索引足標2到最後的元素
print(student[-2:]) #印出從索引足標-2(也就是倒數第二個)到最後的元素

切片的迴圈應用

student = ["alan" , "jack" , "rose" , "bonny", "stan"]

串列複製

student = ["alan" , "jack" , "rose" , "bonny", "stan"]
duty = student[0:2]
for name in duty:
  print(name)

補充 - 「方法」

split
對字串做分割(以空格做切割)
5 10

test = input("test")
test.split

in = input("輸入數字") #A B
num1 = in.split()[1]

簡單來說
test = 5 10
test.split() = ['5' , '10']
test.split() [0] = 5

zerojudge 解題 a002 簡單加法

#split
#方法 vs 函數
math = "5 10"
ans = 0
for i in math.split():
  #print(n)
  ans = ans + int(i)
print(ans)