python基础练习_1.1

    1 打印九九乘法表
    2 打印下方菱形
    3 打印100以内的斐波那契数列
    4 求斐波那契数列第101项
    5 求10万内的所有质数
       *   
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     ***** 
    *******
     ***** 
      ***  
       *   
    6 打印下方的闪电
       *   
      **  
     ***
    *******
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       **  
       *

# 1
for i in range(1,10):
    for j in range(1,i+1):
        print(j,'x',i,'=',i*j,end='\t')
    print()
# 2
for i in range(1,10):    
    for j in range(1,i+1):
        product=i*j
        if product<10:
            end='  '
        else:
            end=' '
        print(str(j)+'*'+str(i)+'='+str(product),end=end)
    print()
# 3
for i in range(1,10):
    for j in range(1,i+1):
        print('{0}*{1}={2:<2}'.format(j,i,j*i),end=' ')
    print()
# 4
i=1
while i<10:
    j=1
    while j<=i:
        print('{0}*{1}={2:<2}'.format(j,i,i*j),end=' ')
        j+=1
    print()
    i+=1

# 1
for i in range(1,10):
    print(' '*7*(i-1),end='')
    for j in range(i,10):
        product=i*j
        if product<10:
            end='  '
        else:
            end=' '
        print(str(j)+'*'+str(i)+'='+str(i*j),end=end)
    print()
# 2 
i=1
j=1
while i<10:
    j=i
    print(' '*7*(i-1),end='')
    while i<=j<10:
        print('{0}*{1}={2:<2}'.format(j,i,i*j),end=' ')
        j+=1
    print()
    i+=1

# 1
for i in range(-3,4):
    if i<0:
        i=-i
    else:
        i=i
    print(' '*i+'*'*(7-2*i))
# 2
for i in range(-3,4):
    print(' '*(-i)+'*'*(7+2*i)) if i < 0 else print(' '*i+'*'*(7-2*i))

# 1
pre=0
suf=1
for _ in range(100):
    sum=pre+suf
    pre=suf
    suf=sum
    if sum>100:
        break
    else:
        print(sum)

# 2
i = 1
j = 1
while i < 100:
    print(i)
    i,j=j,i+j

# 3 
a = 0
b = 1
print(a,b,end=' ')

while True:
    a = a + b
    b = b + a
    if a < 100:
        print(a, end=' ')
    else:
        break
    if b<100:
        print(b,end=' ')
    else:
        break

# 1
count=2
sum_old=0
sum_new=1
sum=0
member=101
if member==1:
    print(1)
else:
    while count<member+1: 
        sum=sum_old+sum_new      
        sum_old=sum_new          
        sum_new=sum 
        count+=1                          
    else:
        print(sum)

# 2
pre=0
suf=1
for _ in range(100):
    sum=pre+suf
    pre=suf
    suf=sum
else:
    print(sum)
# 3
i=1
j=1
for _ in range(100):
    i,j=j,i+j
print(i)

若自然数N不能被不大于根号N的任何素数整除,则N是一个素数
num=1000                   
if num>2:
    print(2)
if num>3:
    print(3)
if num>5:
    print(5)
if num>7:
    print(7)
for num in range(11,num+1,2):
        for i in range(3,int(num**0.5)+1,2):      # int(num**0.5) 必须大于3，所以num最小值大于9,9和10都不是质数，直接从11开始
            if num%i==0:
                break
        else:
            print(num)

# 2
num=10000
if num>=2:
    print(2)
for num in range(3,num,2):
    for i in range(3,int(num**0.5)+1,2):
        if num%i==0:
            break
    else:
        print(num)

for i in range(-3,4):
    if i<0:
        print(' '*(-i)+'*'*(4+i))
    elif i>0:
        print(' '*3+'*'*(4-i))
    else:
        print('*'*7)