第Python初識(shí)邏輯與if語句及用法大全if語句功能

判斷一個(gè)命題的真實(shí)性，如果命題為真(True)則執(zhí)行if的邏輯語句

if語句用法

用法:

ifbool_result:#語法塊

do#業(yè)務(wù)代碼塊注意縮進(jìn)

參數(shù)︰

bool_result:判斷結(jié)果的真假，布爾類型

do:如果bool_result為True時(shí)執(zhí)行任意python代碼

返回值:if屬于關(guān)鍵字，沒有返回值

insane_status='hunger

ifinsane_status=='hunger':

print('xiaomuinvitesInsanetodinner')

xiaomuinvitesInsanetodinner

實(shí)戰(zhàn)

#coding:utf-8

info='mynameisinsane'

info_list=info.split()

print(info_list)

ifinfo_list[0]=='insane':

print(1)

info_list[0]='loafer'

ifinfo_list[1]=='insane':

print(2)

info_list[1]='loafer'

ifinfo_list[2]=='insane':

print(3)

info_list[2]='loafer'

ifinfo_list[-1]=='insane':

print(4)

info_list[-1]='loafer'

print(info_list)

info=''.join(info_list)

print(info)

info='mynameisinsane,iamapythoner,ilovepython'

info_list=info.split()

ifinfo_list[0]in['python','i']:

info_list[0]='*'

ifinfo_list[1]=='python'orinfo_list[1]=='i':

info_list[1]='*'

ifinfo_list[2]=='python'orinfo_list[2]=='i':

info_list[2]='*'

ifinfo_list[3]=='python'orinfo_list[3]=='i':

info_list[3]='*'

ifinfo_list[4]=='python'orinfo_list[4]=='i':

info_list[4]='*'

ifinfo_list[5]=='python'orinfo_list[5]=='i':

info_list[5]='*'

ifinfo_list[6]=='python'orinfo_list[6]=='i':

info_list[6]='*'

ifinfo_list[7]=='python'orinfo_list[7]=='i':

info_list[7]='*'

ifinfo_list[8]=='python'orinfo_list[8]=='i':

info_list[8]='*'

ifinfo_list[9]=='python'orinfo_list[9]=='i':

info_list[9]='*'

ifinfo_list[-1]in['python','i']:

info_list[-1]='*'

print(info_list)

info=''.join(info_list)

print(info)

info='mynameisinsane'

print(len(info))

iflen(info)10andlen(info)!=15:

print(info.replace('insane','loafer