python for迴圈的應用

for迴圈：

1，基礎訓練
方法一例1
for i in (1,2,3,4,5,6,7,8,9,0):
print('
lpc'
) 
print
(i)元素列表：
(1,2,3,4,5,6,7,8,9,0):
for迴圈會對應匹配列表裡每乙個值，直到講所有值迴圈完成結束
方法二例1
for i in range(12,16):
print
(i)結果就是12 13 14 15例2
for i in range(0,10,2):
print
(i)0-10,每次間隔2
例3for a in range(10):
for b in range(10):
print('
axiba
',end=''
) 
print()

2.加強訓練

用for迴圈做三角形
一for a in range(1,6):
for b in range(i,6):
print('
# ',end=''
) 
print()#
# # # # 
## # # 
## # ## 
#二for a in range(0,6):
for b in
range(0,a):
print('
',end='')
for b in range(a,6):
print('
# ',end=''
) 
print()#
# # # # # 
## # # # 
## # # 
## # ## 
#三for a in range(1,6):
for b in range(6,i+1):
print('
# ',end=''
) 
print()#
# # # 
## # # 
## # # 
## # # 
## # # 
四for a in range(1,8):
for b in range(1,a+1):
print('
* ',end=''
) 
for b in range(a,8):
print('
# ',end=''
) 
print
()* #
# # # # # # 
* * #
# # # # # 
* * * #
# # # # 
* * * * #
# # # 
* * * * * #
# # 
* * * * * * #
# * * * * * * * #
五for i in range(1,10):
for j in range(1,11-i):
print('
',end='')
for j in range(1,i):
print('
@ ',end='')
print
()for i in range(1,10):
for j in range(1,i):
print('
',end='')
for j in range(1,11-i):
print('
@ ',end='')
print
() @ 
@ @ 
@ @ @ 
@ @ @ @ 
@ @ @ @ @ 
@ @ @ @ @ @ 
@ @ @ @ @ @ @ 
@ @ @ @ @ @ @ @ 
@ @ @ @ @ @ @ @ @ 
@ @ @ @ @ @ @ @ 
@ @ @ @ @ @ @ 
@ @ @ @ @ @ 
@ @ @ @ @ 
@ @ @ @ 
@ @ @ 
@ @ 
@ 
六for a in range(1,8):
for b in range(1,a+1):
print('
# ',end=''
) 
print()#
## ## # 
## # # 
## # # # 
## # # # # 
## # # # # # 
七for a in range(1,8):
for b in range(a,8):
print('
',end='')
for c in range(1,a):
print('
# ',end=''
) 
print
() ##
# ## # 
## # # 
## # # # 
## # # # # 

3.加強訓練

用for迴圈做乘法口決表
方法一：
for i in range(1,10):
for j in range(1,i+1):
print(str(i)+"
*"+ str(j)+"
="+str(i*j),end="")
print
()方法二：
for i in range(1,10):
for j in range(1,i+1):
print("
%d*%1d=%2d
" % (j,i,i*j) ,end='')
print()

結果：

1*1=1 

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

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