How can I stop a While loop

Question

I wrote a while loop in a function  but don t know how to stop it  When it doesn t meet its final condition  the loop just go for ever  How can I stop it   def determine period universe array       period 0     tmp universe array     while True          tmp apply rules tmp  aplly rules is a another function         period  1         if numpy array equal tmp universe array  is True              break     i want the loop to stop and return 0 if the                        period is bigger than 12         if period gt 12    i wrote this line to stop it  but seems it                          doesnt work    help               return 0         else                 return period

User · Answer

The is operator in Python probably doesn t do what you expect  Instead of this       if numpy array equal tmp universe array  is True          break   I would write it like this       if numpy array equal tmp universe array           break   The is operator tests object identity  which is something quite different from equality

User · Answer

just indent your code correctly   def determine period universe array       period 0     tmp universe array     while True          tmp apply rules tmp  aplly rules is a another function         period  1         if numpy array equal tmp universe array  is True              return period         if period gt 12    i wrote this line to stop it  but seems its doesnt work    help               return 0         else                 return period   You need to understand that the break statement in your example will exit the infinite loop you ve created with while True  So when the break condition is True  the program will quit the infinite loop and continue to the next indented block  Since there is no following block in your code  the function ends and don t return anything  So I ve fixed your code by replacing the break statement by a return statement   Following your idea to use an infinite loop  this is the best way to write it   def determine period universe array       period 0     tmp universe array     while True          tmp apply rules tmp  aplly rules is a another function         period  1         if numpy array equal tmp universe array  is True              break         if period gt 12    i wrote this line to stop it  but seems its doesnt work    help               period   0             break      return period

User · Answer

def determine period universe array       period 0     tmp universe array     while period lt 12          tmp apply rules tmp  aplly rules is a another function         if numpy array equal tmp universe array  is True              break          period  1      return period

User · Answer

The is operator in Python probably doesn t do what you expect  Instead of this       if numpy array equal tmp universe array  is True          break   I would write it like this       if numpy array equal tmp universe array           break   The is operator tests object identity  which is something quite different from equality

User · Answer

I would do it using a for loop as shown below    def determine period universe array       tmp   universe array     for period in xrange 1  13           tmp   apply rules tmp          if numpy array equal tmp  universe array               return period     return 0

User · Answer

def determine period universe array       period 0     tmp universe array     while period lt 12          tmp apply rules tmp  aplly rules is a another function         if numpy array equal tmp universe array  is True              break          period  1      return period

User · Answer

The is operator in Python probably doesn t do what you expect  Instead of this       if numpy array equal tmp universe array  is True          break   I would write it like this       if numpy array equal tmp universe array           break   The is operator tests object identity  which is something quite different from equality

User · Answer

I would do it using a for loop as shown below    def determine period universe array       tmp   universe array     for period in xrange 1  13           tmp   apply rules tmp          if numpy array equal tmp  universe array               return period     return 0

User · Answer

just indent your code correctly   def determine period universe array       period 0     tmp universe array     while True          tmp apply rules tmp  aplly rules is a another function         period  1         if numpy array equal tmp universe array  is True              return period         if period gt 12    i wrote this line to stop it  but seems its doesnt work    help               return 0         else                 return period   You need to understand that the break statement in your example will exit the infinite loop you ve created with while True  So when the break condition is True  the program will quit the infinite loop and continue to the next indented block  Since there is no following block in your code  the function ends and don t return anything  So I ve fixed your code by replacing the break statement by a return statement   Following your idea to use an infinite loop  this is the best way to write it   def determine period universe array       period 0     tmp universe array     while True          tmp apply rules tmp  aplly rules is a another function         period  1         if numpy array equal tmp universe array  is True              break         if period gt 12    i wrote this line to stop it  but seems its doesnt work    help               period   0             break      return period

User · Answer

The is operator in Python probably doesn t do what you expect  Instead of this       if numpy array equal tmp universe array  is True          break   I would write it like this       if numpy array equal tmp universe array           break   The is operator tests object identity  which is something quite different from equality

User · Answer

just indent your code correctly   def determine period universe array       period 0     tmp universe array     while True          tmp apply rules tmp  aplly rules is a another function         period  1         if numpy array equal tmp universe array  is True              return period         if period gt 12    i wrote this line to stop it  but seems its doesnt work    help               return 0         else                 return period   You need to understand that the break statement in your example will exit the infinite loop you ve created with while True  So when the break condition is True  the program will quit the infinite loop and continue to the next indented block  Since there is no following block in your code  the function ends and don t return anything  So I ve fixed your code by replacing the break statement by a return statement   Following your idea to use an infinite loop  this is the best way to write it   def determine period universe array       period 0     tmp universe array     while True          tmp apply rules tmp  aplly rules is a another function         period  1         if numpy array equal tmp universe array  is True              break         if period gt 12    i wrote this line to stop it  but seems its doesnt work    help               period   0             break      return period

User · Answer

I would do it using a for loop as shown below    def determine period universe array       tmp   universe array     for period in xrange 1  13           tmp   apply rules tmp          if numpy array equal tmp  universe array               return period     return 0

User · Answer

I would do it using a for loop as shown below    def determine period universe array       tmp   universe array     for period in xrange 1  13           tmp   apply rules tmp          if numpy array equal tmp  universe array               return period     return 0

User · Answer

def determine period universe array       period 0     tmp universe array     while period lt 12          tmp apply rules tmp  aplly rules is a another function         if numpy array equal tmp universe array  is True              break          period  1      return period

User · Answer

just indent your code correctly   def determine period universe array       period 0     tmp universe array     while True          tmp apply rules tmp  aplly rules is a another function         period  1         if numpy array equal tmp universe array  is True              return period         if period gt 12    i wrote this line to stop it  but seems its doesnt work    help               return 0         else                 return period   You need to understand that the break statement in your example will exit the infinite loop you ve created with while True  So when the break condition is True  the program will quit the infinite loop and continue to the next indented block  Since there is no following block in your code  the function ends and don t return anything  So I ve fixed your code by replacing the break statement by a return statement   Following your idea to use an infinite loop  this is the best way to write it   def determine period universe array       period 0     tmp universe array     while True          tmp apply rules tmp  aplly rules is a another function         period  1         if numpy array equal tmp universe array  is True              break         if period gt 12    i wrote this line to stop it  but seems its doesnt work    help               period   0             break      return period

User · Answer

def determine period universe array       period 0     tmp universe array     while period lt 12          tmp apply rules tmp  aplly rules is a another function         if numpy array equal tmp universe array  is True              break          period  1      return period

[python] How can I stop a While loop?

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