Python: for迴圈

#Python: for迴圈

#for x in :

#range(要執行幾次)

#range(開始值,結束值(不算))

#range(開始值,結束值,間距)

for index in range(6):  #range = 0~5,從0開始
  print(“第”+str(index)+”次”) #前面要縮排

執行結果:

for index in range(3,8):
print(“第”+str(index)+”次”) #前面要縮排

執行結果:

for index in range(2,10,2):
print(“第”+str(index)+”次”) #前面要縮排

執行結果:

#把字串拆為字元

for a in “computer”:  #記得要” “
    print(a)  #要縮排

執行結果:

c
o
m
p
u
t
e
r

#讀陣列

member_ID = [“A1″,”B2″,”C3″,”D4”]

print(member_ID)

for member in member_ID : print(member)

執行結果:

[‘A1’, ‘B2’, ‘C3’, ‘D4’]
A1
B2
C3
D4

#讀陣列
member_ID = [“A1″,”B2″,”C3″,”D4”]

print(member_ID)

for member in member_ID :
    print(member)    #要縮排
    if member == “B2”: break #要縮排

執行結果:

[‘A1’, ‘B2’, ‘C3’, ‘D4’]
A1
B2

#讀陣列
member_ID = [“A1″,”B2″,”C3″,”D4”]

print(member_ID)

for member in member_ID :

    if member == “B2”: break
    print(member)  #print放後面,少一個

執行結果:

[‘A1’, ‘B2’, ‘C3’, ‘D4’]
A1

#讀陣列
member_ID = [“A1″,”B2″,”C3″,”D4”]

print(member_ID)

for member in member_ID :

    if member == “B2″: print(member + ” is VIP”)

    print(member)

執行結果:

#讀陣列
member_ID = [“A1″,”B2″,”C3″,”D4”]

print(member_ID)

for member in member_ID :

    if member == “B2”: continue  #break是跳出迴圈,continue只有此次略過

    print(member)

執行結果:

[‘A1’, ‘B2’, ‘C3’, ‘D4’]
A1
C3
D4

#迴圈中的迴圈
#九九乘法表

for x in range(1,10):
    for y in range(1,10):
           z=x*y
           print(str(x)+”*”+str(y)+”=” + str(z))

執行結果:

1*1=1
1*2=2
1*3=3
1*4=4
1*5=5
1*6=6
1*7=7
1*8=8
1*9=9
2*1=2
2*2=4
2*3=6
2*4=8
2*5=10
2*6=12
2*7=14
2*8=16
2*9=18
3*1=3
3*2=6
3*3=9
3*4=12
3*5=15
3*6=18
3*7=21
3*8=24
3*9=27
4*1=4
4*2=8
4*3=12
4*4=16
4*5=20
4*6=24
4*7=28
4*8=32
4*9=36
5*1=5
5*2=10
5*3=15
5*4=20
5*5=25
5*6=30
5*7=35
5*8=40
5*9=45
6*1=6
6*2=12
6*3=18
6*4=24
6*5=30
6*6=36
6*7=42
6*8=48
6*9=54
7*1=7
7*2=14
7*3=21
7*4=28
7*5=35
7*6=42
7*7=49
7*8=56
7*9=63
8*1=8
8*2=16
8*3=24
8*4=32
8*5=40
8*6=48
8*7=56
8*8=64
8*9=72
9*1=9
9*2=18
9*3=27
9*4=36
9*5=45
9*6=54
9*7=63
9*8=72
9*9=81