ããã°ã©ã ã®åºæ¬çãªæµãã¯äžããäžãžäžè¡ãã€å®è¡ããŠãããšãããã®ã§ããåçŽãªããã°ã©ã ã§ããšãããã¹ããã¡ã€ã«ã«å®æœããåŠçãé çªã«çŸ åããã ãã§å®çŸã§ããŸããããããããããåŠçããšåŒã°ããŠãããã€ã§ãã
ãã ãè€éãªããã°ã©ã ã ãšããã®ãããªãäžããäžã«é çªã«å®è¡ããŠããããšããã¹ã¿ã€ã«ã ãã§ã¯åŠçãå®çŸã§ããªããªã£ãŠããŸããããšãã°ã倩æ°äºå ±ã確èªããã¢ããªã±ãŒã·ã§ã³ã§ã¯ãã仿¥ãæŽããªãæŽãããŒã¯ã衚瀺ãéšãªãéšããŒã¯ã衚瀺ããšãã£ãå ·åã«ããããã®ãAãªãBããããããã§ãªããªãCãããããšããåŠçãå¿ èŠã«ãªã£ãŠããŸãããæ¡ä»¶ãã«å¿ããŠåŠçããåå²ãããŠããã®ã§ããããã£ãåŠçã®ããšããæ¡ä»¶åå²ããšãããŸãã
ã»ãã«ã¯ãåãåŠçãäœåºŠãç¹°ãè¿ããã«ãŒãåŠçãããããŸããããšãã°ããã¯ã©ã¹å šå¡ã®ãã¹ãã®å¹³åç¹ãæ±ãããã®å¹³åç¹ãšåçåŸã®ç¹æ°ã®å·®åããã§ãã¯ããããšãã£ãå ŽåãèããŠã¿ãŸããããå¹³åãæ±ããã«ã¯ãçåŸã®ç¹æ°ã®åèš/人æ°ããšããå¿ èŠããããŸããããã®åèšãæ±ããããã«ãå é ã®çåŸããæåŸã®çåŸãŸã§é çªã«ç¹æ°ãè¶³ããŠããããšãããç¹°ãè¿ã(ã«ãŒã)ããå¿ èŠãšãªããŸããå¹³åãšã®å·®åã®ç®åºãåæ§ã§ãã
ä»åã¯ãã®ãããªæ¡ä»¶åå²ãã«ãŒãåŠçãšãã£ããããã°ã©ã ã®å¶åŸ¡æ§é ãã«ã€ããŠåãæ±ããŸãããããã®åŠçã䜿ãããšèªäœã¯ããã»ã©é£ãããªãã®ã§ãäœåºŠãæžããŠæ £ããŠããŸãã°ãç°¡åã«äœ¿ãããªããããã«ãªãã¯ãã§ãã
ãªããä»ãŸã§ã®èšäºã§ã¯ããã³ããããŒã¹ã§èª¬æãé²ããŠããŸããããã³ãŒããé·ããªãã¯ãããã®ã§ããã°ã©ã ãã¡ã€ã«ã§å®è¡ããããšãåæã«è§£èª¬ããŸããIDLEã®ãšãã£ã¿ã§æžããŠF5(Macã¯Fn + F5)ã§å®è¡ãããªããpythonã³ãã³ãã§å®è¡ãããªãããŠãã ããã
æ¡ä»¶åå²
ãã£ãããæã䜿ãããå¶åŸ¡æ§é ã®ã²ãšã€ã§ãããæ¡ä»¶åå²ãã«ã€ããŠåŠãã§ãããŸããããæ¡ä»¶åå²ã¯ãæ¡ä»¶åå²ã®åŒãæºãããæºãããªããã§å®è¡ãããåŠçãå€ãããšããå¶åŸ¡æ§é ã§ããåã«ã€ããŠåãæ±ã£ãéã«ç޹ä»ãããBoolåããæ¡ä»¶å€å®ã«å©çšããããã®å€ãTrueãFalseãã§å®è¡ããããã°ã©ã ãå€ãããŸãã
以äžã«æ¡ä»¶åå²ã®ä»çµã¿ãå³ã§èšããŸãã
äžèšã®å³ã®ãã¡ããelifãã¯ä»»æã®æ°(0ãå«ã)ç¹°ãè¿ãããšãã§ãããelseããçç¥ããããšãã§ããŸããelseããªããšãã¯ãã©ã®æ¡ä»¶ã«ãåèŽããªãå Žåã¯äœãããªããšããããšã§ããPythonã®ããã°ã©ã ã§ã¯ä»¥äžã®ããã«æžããŸãã
if(æ¡ä»¶A):
åŠç1-1 # æ¡ä»¶ A ã True ã®æã«å®è¡ãããåŠç
åŠç1-2
elif(æ¡ä»¶B):
åŠç2 # æ¡ä»¶ A ã False ã§æ¡ä»¶ B ã True ã®æã«å®è¡ãããåŠç
elif(æ¡ä»¶C):
åŠç3 # æ¡ä»¶ A,B ã False ã§æ¡ä»¶ C ã True ã®æã«å®è¡ãããåŠç
else:
åŠç4 # å
šãŠã®æ¡ä»¶ã False ã®æã«å®è¡ãããåŠç
äžèšã®ifããelseã®æ¬¡ã®è¡ãŸã§ãã²ãšã€ã®ãifæã®ã«ããŒç¯å²ãã§ããããã®ãªãã«ããifãelifãelseã现ããåŠçã®åäœã ãšæã£ãŠããã ããã°å€§äžå€«ã§ãã
äžèšã®ããã°ã©ã ã«ã¯ãifãelseãelifã®ããšã®åŠçãåäžã(ã€ã³ãã³ã)ãããŠããããšããèŠåæ§ãèŠããŸããããã®ã€ã³ãã³ããããŠããå Žæã¯ãã³ãŒããããã¯ããšåŒã°ãããã®ã§ãåãã€ã³ãã³ãã®ã¬ãã«(æ·±ã)ã§æãããšåãã³ãŒããããã¯ã«å±ããŠãããšã¿ãªãããŸãããªãã ãé£ããããã§ãããããããã«äžèšã®ifæã§ãããšãåŠç1-1ã1-2ã¯if(æ¡ä»¶A)ã®ã«ããŒç¯å²ãã§ãããšããããšã§ããåæ§ã«åŠç2ã¯ãelif(æ¡ä»¶B)ãã®ç¯å²ã§ãããåŠç3ã¯ãelif(æ¡ä»¶C)ããåŠç4ã¯ãelseãã®ç¯å²ã§ãã
å®éã«æ¡ä»¶åå²ãè¡ãããã°ã©ã ãæžãããšã§ãæ¡ä»¶åå²ã®äœ¿ãæ¹ãã€ã¡ãŒãžããŠã¿ãŸããããããã°ã©ã ã¯éåžžã«ç°¡åã§ã倿°xã®å€ã0ãã倧ãããã°ã+ããšåºåããããã¿ãª0ãªãã0ããšãZeroãã0æªæºãªãã-ããšåºåãããšãããã®ã§ããããã¯ä»¥äžã®ããã«ãªããŸãã
x = 5
if(x > 0):
print('+')
elif(x == 0):
print('0')
print('Zero')
else:
print('-')
ç¹°ãè¿ãã«ãªããŸãããprint('0')ããšãprint('Zero')ãã¯åãã³ãŒããããã¯ã§ããäžèšããã°ã©ã ãIDLEã®ãšãã£ã¿ã«æžããŠå®è¡ããŠã¿ãŠãã ãããxã«5ãä»£å ¥ãããŠããã®ã§ãã+ããšåºåãããã¯ãã§ããããã¯x > 0ã®æ¡ä»¶åŒãæºããã(Trueãšãªã)ããprint('+')ããå®è¡ãããããã§ãã
ãã®xã«ä»£å ¥ããå€ãããããå€ããŠåãããŠã¿ããšãã©ã®æ¡ä»¶åŒããã§ãã¯ããããifãelifãelseãã®ã©ã®åŠçãå®è¡ãããã®ãã€ã¡ãŒãžã§ããã¯ãã§ãã
ã³ãŒããããã¯
æ¡ä»¶åå²ã®è©±ãçµãã£ãã®ã§ãã€ã³ãã³ã(åäžã)ã«ã€ããŠããå°ã詳ããã話ããŸããããå ã»ã©ã®ããã°ã©ã ã¯æåããæåŸãŸã§ifæã§ããããå®éã«ã¯ãifæã¯å€ãã®åŠçã®ãªãã«åãããããã¡ã§åŠçããŸãã
ãããšãifãªã©ã®å¶åŸ¡æ§é ããã©ãããã©ããŸã§ãã«ããŒããŠãããããã©ã®ãããªåœ¢ã§è¡šçŸããããåé¡ã«ãªã£ãŠããŸããããšãã°ãåŠç1ã2ã3ã4ã5ãšãããªãã§æ¡ä»¶Aãæºããå Žåã®ã¿åŠç2ã3ãå®è¡ããæºãããªãå Žåã¯4ãå®è¡ãããšããå Žåãã©ã®ããã«è¡šçŸããã°ããã§ããããã
åã®ãããããªãæ°ãä»ããããããããŸããããã€ã³ãã³ã(åäžã)ãããããšã§ãããå®çŸããŠããŸãã
åŠç1
if(æ¡ä»¶A):
# ãããã
åŠç2
åŠç3
# ãããŸã§ãã³ãŒããããã¯
else:
# ãããã
åŠç4
# ãããŸã§ãã³ãŒããããã¯
åŠç5
åäžããããããšã§ã³ãŒããããã¯ã衚çŸãããç°¡åã§ããã
ãªããCãJavaã«ãã³ãŒããããã¯ã¯ãããŸããããã®æžãæ¹ã¯ç°ãªã£ãŠããŸããããšãã°Javaã ãšäžèšã®ãµã³ãã«ã³ãŒãã¯ä»¥äžã®ãããªãã®ãšãªããŸãã
åŠç1
if(æ¡ä»¶A){
// ãããã
åŠç2 // åäžãã¯å¿
é ã§ã¯ãªã
åŠç3
ã // ãããŸã§ãã³ãŒããããã¯
}else{
// ãããã
åŠç4
ã // ãããŸã§ãã³ãŒããããã¯
}
åŠç5
{}ã§å²ãããšã§ã³ãŒããããã¯ã衚ããŠããŸãããããŠãã¯èªã¿ãããããã«äžèšã®ããã«ã€ã³ãã³ããããŸãããããã°ã©ã ãšããŠã¯ã€ã³ãã³ããããå¿ èŠæ§ã¯ãããŸããã
ã³ãŒããããã¯ã¯ifãã«ãŒããªã©ã®å¶åŸ¡æ§é ã ãã§ã¯ãªãã颿°ãã¯ã©ã¹ã§ãå©çšãããŸãããªããPythonã®ã€ã³ãã³ãã®ä»æ¹ã¯ãåè§ç©ºçœã2ã€ãŸãã¯4ã€ããæ®éã ãšæããŸããèªåãå±ãããããžã§ã¯ãã®ã³ãŒãã£ã³ã°èŠçŽæ¬¡ç¬¬ãããã°ããã«åŸã£ãŠãã ããã
ã³ãŒããããã¯ã®ãã¹ã(å ¥ãå)
ã³ãŒããããã¯ã®äžã«ã³ãŒããããã¯ãäœãããšãå¯èœã§ããããšãã°æ¡ä»¶åå²ã®äžã«ãããã«æ¡ä»¶åå²ãäœã£ããããããšãã§ããŸããæžãæ¹ã¯ç°¡åã§ãã³ãŒããããã¯ã®å åŽã«ããã«ã³ãŒããããã¯ãäœããšãããã®ã§ãããã®éãå åŽã®ã³ãŒããããã¯ã¯å€åŽã®ã³ãŒããããã¯ã«å±ããŠããŸãã
ãµã³ãã«ã³ãŒãããããŠã¿ãŸãã
if(æ¡ä»¶A):
åŠç1 # "if(æ¡ä»¶1)"ã®ã³ãŒããããã¯ã«å±ãã
if(æ¡ä»¶B):
åŠç2 # "if(æ¡ä»¶1)" ãš "if(æ¡ä»¶2)" ã®äž¡æ¹æ³ã®ã³ãŒããããã¯ã«å±ãã
åŠç3
else:
åŠç4
åŠç1ã2ã3ã¯ãã¹ãŠãif(æ¡ä»¶1)ãã®ã³ãŒããããã¯ã«å±ããŠããŸãããåŠç2ã ãã§ã¯ããã«å ã㊠ãif(æ¡ä»¶B):ãã«ãå±ããŠããŸãããã®ãããåŠç2ãå®è¡ãããã®ã¯æ¡ä»¶AãBãå ±ã«Trueã®ãšãã®ã¿ã§ããããšãæ¡ä»¶BãTrueã§ãã£ãŠããæ¡ä»¶AãFalseãªãåŠç2ã¯å®è¡ãããŸããã
ãªããã³ãŒããããã¯ã«éãããããã°ã©ãã³ã°ã§ãå ¥ãåãæ§é ã«ããããšãäžè¬çã«ããã¹ãããããšèšããŸãã®ã§èŠããŠãããŠãã ããããã¹ãããããšèªäœã«ã¯åé¡ã¯ãããŸãããããã®æ·±ããå¢ããŠãããšããã°ã©ã ãéåžžã«èªã¿ã«ãããªããŸããæ·±ãã¬ãã«ã®ãã¹ããå¿ èŠãªç¶æ³ã«ãªã£ãŠããããã¢ã«ãŽãªãºã ãã®ãã®ãèŠçŽãããåŸã®é£èŒã§æ±ãã颿°ãã«åŠçãåå²ããããšã§èªã¿ãããããããšãå€ãã§ãã
ã«ãŒãåŠç
次ã«ãå¥ã®å¶åŸ¡æ§é ã§ããã«ãŒãåŠçã«ã€ããŠæ±ããŸããã«ãŒãåŠçã¯ãã®ååãããããããã«ãåãåŠçãäœåºŠãç¹°ãè¿ãããšããåŠçã§ãã
ã«ãŒãåŠçã®å¶åŸ¡æ§é ã«ã¯forãšwhileã®2ã€ããããäž¡è ã®äœ¿ãã¹ããã€ã³ãã¯è¥å¹²ç°ãªã£ãŠããŸãããã®ãããããããå¥ã«èª¬æããŸãã
for
ãforãã¯ãã°ã«ãŒãã«ããèŠçŽ ãã¹ãŠãåŠçããããšãã£ããšãã«äœ¿ãããã«ãŒãæ§é ã§ããäžçªãã䜿ãããã®ããååã話ãããªã¹ã(é å)ã«æ ŒçŽãããŠããèŠçŽ ãã¹ãŠããã§ãã¯ãããããªåŠçã§ããJavaãCã§äœ¿ãããforæãšæžãæ¹ã¯ããªãç°ãªããã®ã®ãã»ãšãã©åããããªå Žé¢ã§äœ¿ããŸãã
Pythonã®foræã®ã€ã¡ãŒãžã以äžã®å³ã«æžããŸãã
é£ããçšèªã§ãããšãã€ãã¬ãŒã¿ãŒããšåŒã°ããåŠçæ¹åŒãªã®ã§ãããããããã«ãããããããéåã®å é ã²ãšã€ãåãåºããŠããããåŠçããããããçµãã£ãããæ¬¡ãåãåºããŠåŠçãããããšããããšããéåã空ã«ãªããŸã§ç¹°ãè¿ããšããã€ã¡ãŒãžã§ãã
ããã»ã©é£ãããªãã®ã§äŸã§ç€ºããŸãããã1ã2ã3ã4ã5ãšããæ°åãæ ŒçŽãããŠãããªã¹ãã®äžèº«ãäžã€ã²ãšã€ãã¹ãŠprintåºåããåŠçãforã§æžããšä»¥äžã®ããã«ãªããŸãã
a = [1,2,3,4,5]
for i in a:
print(i)
1ã2ã3ã4ã5ãšããéåããã
- ãªã¹ã a ãã 1 ãåãåºã㊠i ã«æ ŒçŽããããprintåºå
- ãªã¹ã a ãã 2 ãåãåºã㊠i ã«æ ŒçŽããããprintåºå
- âŠ(äžç¥)âŠ
- ãªã¹ã a ãã 5 ãåãåºã㊠i ã«æ ŒçŽããããprintåºå
- ãªã¹ã a ãããã¹ãŠãåãåºããã®ã§forã®ã³ãŒããããã¯ãçµäº
ãšããåããããŸãããã§ã«æ³åã¯ã€ããŠããããšæããŸãããåºåã¯ä»¥äžã®ããã«ãªããŸãã
1
2
3
4
5
ã€ãã¬ãŒã¿ãŒã䜿ã£ãŠããã®ã§ãJavaã®foræã§äœ¿ããããªãã€ã³ããã¯ã¹(é åã®äœçªç®ã)ã«ããå¶åŸ¡ãã«æ¯ã¹ãŠãééã£ãèŠçŽ ãæå®ãããªã¹ã¯ãæžã£ãŠããŸãã
while
whileãforãšåããã«ãŒãåŠçã®ããã®å¶åŸ¡æ§é ã§ãããã ãwhileã¯ãã«ãŒããäœåšããã°ãããããããªãåŠçãã«å©çšãããŸãã
å ã»ã©ã®forã®äŸãæãåºããŠäžãããforã§ã®ã«ãŒãåæ°ã¯ããªã¹ãaã«æ ŒçŽãããŠããèŠçŽ ã®æ°ããšæç¢ºã«ããããŸãããããã®ãããªå Žåã¯forã§åŠçãã¹ãã§ããäžæ¹ãããšãã°ã123456789ãšããæ°åã2鲿°ã§è¡šçŸããã®ã«å¿ èŠãªæ¡æ°ãæ±ããåŠçããå¿ èŠã ãšããå Žåããããã©ãforæã§åŠçããã°ããããæ³åã§ããŸãããç§ã¯ã·ã³ãã«ã§ã¹ããŒããªå®è£ ã¯æãã€ããªãã§ãã
è§£ãæ¹ã¯ãããããããšæããŸãããäžçªç°¡åãªè§£æ³ã®äžã€ãšããŠã以äžã®ãããªãã®ãèããããŸãã
- 2 ã® 1 ä¹ã¯ 123456789 ãã倧ãããã-> No
- 2 ã® 2 ä¹ã¯ 123456789 ãã倧ãããã-> No
- ..
- 2 ã® N ä¹ã¯ 123456789 ãã倧ãããã-> No
- 2 ã® N+1 ä¹ã¯ 123456789 ãã倧ãããã-> YES
- N+1æ¡ããã° 123456789 ã衚çŸå¯èœã ãšããã
ãã®åŠçã§ã¯2ã1ä¹ã2ä¹ãšã«ãŒãåŠçã§ã©ãã©ã倧ããããŠãããŸãããæçµçã«2ã®äœä¹ã«ãªãããããããŸããããããã®ãããªãšãã«ãç¹å®ã®æ¡ä»¶ãã¯ãªã¢ãããŸã§ã«ãŒããåããããã«whileã䜿ããšäŸ¿å©ã§ãã
以äžã«whileæã®äœ¿ãæ¹ã®ã€ã¡ãŒãžå³ãã®ããŸãã
äžèšã®å³ãèŠãŠããããšãããããã«ãwhileæã¯ã«ãŒããåãããšã«æ¡ä»¶åŒããã§ãã¯ããŠããããTrueãªãã«ãŒããç¶ç¶ããŠãFalseãªãã«ãŒããæãããšããåŠçãããŸããããã¯JavaãCã®whileãšãŸã£ããåãã§ãã
å ã»ã©ã®2鲿°ã®æ¡æ°ãæ±ããããã°ã©ã ãwhileã§æžããŠã¿ãŸãã
a = 123456789
i = 1
while(2**i < a):
i+=1
print(i)
ãã§ã«æ±ã£ãå 容ã§ãããäžèšã®ããã°ã©ã ãè£è¶³ãããšã2**iã¯ã2ã®iä¹ããèšç®ããŠããŠãi+=1ã¯iãã€ã³ã¯ãªã¡ã³ã(i = i + 1)ããŠããŸãã2**iã123456789ããå°ããéã¯iãã€ã³ã¯ãªã¡ã³ãããŠããã2**iã123456789ãã倧ãããªã£ããã«ãŒããæãããšããåããããŸããã«ãŒããæããéiã«å ¥ã£ãŠããå€ãå¿ èŠãªæ¡æ°ã衚ããŠããŸãã
break ãš continue
å¶åŸ¡ãã®ãã®ã®æã¡åãããã«ãŒãã®ãã®åã ããã®æã¡åããå¿ èŠãªå Žé¢ããããŸããããšãã°ä»¥äžã®ãããªããã°ã©ã ããããšããŸãã
a = [1,3,5,7,9,10,11,13,15]
has_even = False
for i in a:
if(i%2 == 0):
has_even = True
print("List has even: " + str(has_even))
å¶æ°ããªã¹ãã®äžã«ãããã©ããããã§ãã¯ããŠããŸããããªã¹ãã®äžã«10ãããã®ã§ãåœç¶TrueãšãªããŸãããã ãããèããŠã¿ãŠãã ããããªã«ãç¡é§ãªåŠçããããšæããŸãããããããã«ãŒãã10ã«ãªã£ãåã§å¶æ°ãããããšãããã£ãã®ã«ãããã«ãã§ãã¯ãç¹°ãè¿ããŠããŸãã10ãçŸããæç¹ã§å¶æ°ãããããšã¯ããããã£ãŠããã®ã§ãã«ãŒããåãç¶ããã®ã¯ç¡é§ãªã®ã§ãã
ãbreakãã䜿ã£ãŠåŠçãæã¡åãããšã§ããã®åé¡ã解決ã§ããŸãã
a = [1,3,5,7,9,10,11,13,15]
has_even = False
for i in a:
print(i) # NEW CODE
if(i%2 == 0):
has_even = True
break # NEW CODE
print("List has even: " + str(has_even))
確èªã®ããã«breakã ãã§ãªããprintæã远å ããŠããŸãããããå®è¡ãããšä»¥äžã®ããã«ãªããŸãã
1
3
5
7
9
10
List has even: True
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a = []
for i in range(1,100):
if(i%3 == 0):
if(i%5 == 0):
print(i)
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a = []
for i in range(1,100):
if(i%3 != 0):
continue
if(i%5 != 0):
continue
print(i)
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while(True):
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break
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