Python 巢狀迴圈

#

巢狀迴圈

forxinrange(5

):foryinrange(5

):print

(x,end

="\t")

# \t

製表符print

("\n")

#print

天然有換行，新增\n也是換行

#列印九九乘法表

forminrange(1

,10):forninrange(1

,m+1

):print

("*=".format(m,n,m*n),

end="\t")

print()#

換行#用列表和字典儲存**資訊

r1=dict

(name

="spy",

age=18,

salary

=10000

,city

="北京")

r2=dict

(name

="py",

age=19,

salary

=20000

,city

="上海")

r3=dict

(name

="y",

age=20,

salary

=30000

,city

="深圳")

tb=[r1,r2,r3]

forxintb:

ifx.get("salary")>

20000

:print

(x)

用於while或for迴圈，中斷迴圈，跳出最近一層的迴圈

用於結束本次迴圈，繼續下一次。

#測試break，結束整個迴圈

while true:

a =

input

("請輸入乙個字元（q或q）:")

ifa=="q"ora=="q":

print

("迴圈結束，退出")

break

else:

print

(a)

#測試continue，結束本次迴圈，繼續下一次

empnum=

0salarysum=

0salarys =

while true:

s =

input

("please emp salary(q or q exit):")

ifs =="q"ors=="q":

print

("錄入完畢，退出")

break

iffloat

(s) < 0:

continue

empnum +=

1float

(s))

salarysum +=

float

(s)print

("員工數".format(empnum))

print

("錄入薪資：",salarys)

print

("平均薪資：".format(salarysum/empnum))

while/for迴圈可以附帶乙個else語句。

如果while/for語句被break中斷，則會不會執行else語句，否則執行else語句

#測試for迴圈中的else語句，迴圈被中斷，else不執行；否則else執行

empnum=

0salarysum=

0salarys =

foriinrange(4

):s =

input

("please emp salary(q or q exit):")

ifs =="q"ors=="q":

print

("錄入完畢，退出")

break

iffloat

(s) < 0:

continue

empnum +=

1float

(s))

salarysum +=

float

(s)else:

#迴圈4次，迴圈未中斷，else執行；否則else不執行

print

("你已經全部錄入4名員工的薪資")

print

("員工數".format(empnum))

print

("錄入薪資：",salarys)

print

("平均薪資：".format(salarysum/empnum))

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