Python 11 second day

One or three-dollar operation

Format:

Variable = value 1 if condition else value two

Example 1:

A=3

Name = "Wang" if a = = 2 Else "Zhang"

Print Name

Example 2:

A=input ("pls input a num:")

Print "OK" if a = = 2 Else "NO"

Second, Pycharm breakpoint debugging:

First hit the breakpoint in the key place, run debug mode, at this point to the first breakpoint of the line display highlighting, it will be executed here, but not yet executed, and then continue to the point of execution, will be executed this row, and there will be a debugger window, where all the variable values at this breakpoint are placed, The console window shows the output of the execution.

Third, all objects in Python

Everything is an object, and the object is created by the class.

such as the list of class lists, such as:

mylist=[1,33, ' Wang ']

MyList is the instantiation of a list class, and it also has all the functions of the lists class, such as Append,pop.

View the type of an object by type ()

View all features of an object via Dir ()

Help () View the object's source code, the detailed function.

Iv. built-in methods for data types

1, int integer type

The int type defaults to 10, such as:

i=10

I=int (10)

You can also improve the system, such as:

B=int ("1101", base=2)

Print "B is%s"% b

E=int ("E", base=16)

Print E

The built-in function of integral type can be seen with Dir ():

[' __abs__ ', ' __add__ ', ' __and__ ', ' __class__ ', ' __cmp__ ', ' __coerce__ ', ' __delattr__ ', ' __div__ ', ' __divmod__ ', ' __doc_ _ ', ' __float__ ', ' __floordiv__ ', ' __format__ ', ' __getattribute__ ', ' __getnewargs__ ', ' __hash__ ', ' __hex__ ', ' __index__ ' ', ' __init__ ', ' __int__ ', ' __invert__ ', ' __long__ ', ' __lshift__ ', ' __mod__ ', ' __mul__ ', ' __neg__ ', ' __new__ ', ' __nonzero ' __ ', ' __oct__ ', ' __or__ ', ' __pos__ ', ' __pow__ ', ' __radd__ ', ' __rand__ ', ' __rdiv__ ', ' __rdivmod__ ', ' __reduce__ ', ' __ Reduce_ex__ ', ' __repr__ ', ' __rfloordiv__ ', ' __rlshift__ ', ' __rmod__ ', ' __rmul__ ', ' __ror__ ', ' __rpow__ ', ' __rrshift__ ' , ' __rshift__ ', ' __rsub__ ', ' __rtruediv__ ', ' __rxor__ ', ' __setattr__ ', ' __sizeof__ ', ' __str__ ', ' __sub__ ', ' __ Subclasshook__ ', ' __truediv__ ', ' __trunc__ ', ' __xor__ ', ' bit_length ', ' conjugate ', ' denominator ', ' imag ', ' numerator ', ' Real ']

2. str character type

The built-in functions of STR can be seen with the Dir () function:

[' __add__ ', ' __class__ ', ' __contains__ ', ' __delattr__ ', ' __doc__ ', ' __eq__ ', ' __format__ ', ' __ge__ ', ' __getattribute__ ' ', ' __getitem__ ', ' __getnewargs__ ', ' __getslice__ ', ' __gt__ ', ' __hash__ ', ' __init__ ', ' __le__ ', ' __len__ ', ' __lt__ ', ' __ Mod__ ', ' __mul__ ', ' __ne__ ', ' __new__ ', ' __reduce__ ', ' __reduce_ex__ ', ' __repr__ ', ' __rmod__ ', ' __rmul__ ', ' __setattr__ ', ' __sizeof__ ', ' __str__ ', ' __subclasshook__ ', ' _formatter_field_name_split ', ' _formatter_parser ', ' capitalize ', ' Center ', ' count ', ' decode ', ' encode ', ' endswith ', ' expandtabs ', ' find ', ' format ', ' Index ', ' isalnum ', ' isalpha ', ' isdigit ' ', ' islower ', ' isspace ', ' istitle ', ' isupper ', ' join ', ' ljust ', ' lower ', ' lstrip ', ' partition ', ' replace ', ' rfind ', ' Rinde X ', ' rjust ', ' rpartition ', ' rsplit ', ' Rstrip ', ' Split ', ' splitlines ', ' startswith ', ' strip ', ' swapcase ', ' title ', ' transl ' Ate ', ' upper ', ' Zfill ']

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Python 11 second day