Type Conversion

We use type names to convert from one type to another. Below are some examples of type conversions and their resulting values.

print("boolean conversions")
print("-------------------------------------------------------------")
print("int(True)         -> " + str(int(True))   + "            # bool to int")
print("float(False)      -> " + str(float(False))   + "          # bool to float")
print("str(True)         -> '" + str(True)   + "'       # bool to str")
print("\ninteger conversions")
print("-------------------------------------------------------------")
print("bool(1)           -> " + str(bool(1)) + "         # int to bool")
print("float(1234567)    -> " + str(float(1234567)) + "    # int to float")
print("str(1234567)      -> '" + str(1234567)   + "'    # int to str")
print("\nfloat conversions")
print("-------------------------------------------------------------")
print("bool(1.0)         -> " + str(bool(1.0)) + "         # float to bool")
print("int(3.99)         -> " + str(int(3.99)) + "            # float to int")
print("int(-3.99)        -> " + str(int(-3.99)) + "           # negative float to int")
print("str(3.99)         -> '" + str(3.99) + "'       # float to str")
print("\nstring conversions")
print("-------------------------------------------------------------")
print("bool('False')     -> " + str(bool('False')) + "         # str to bool")
print("int('1234567')    -> " + str(int('1234567')) + "      # str to int")
print("float('1234567')  -> " + str(float('1234567')) + "    # str to float")
print("\nascii conversions")
print("-------------------------------------------------------------")
print("ord('A')          -> " + str(ord('A')) + "           # str to ascii")
print("chr(122)          -> '" + str(chr(122)) + "'          # ascii to str")

boolean conversions
-------------------------------------------------------------
int(True)         -> 1            # bool to int
float(False)      -> 0.0          # bool to float
str(True)         -> 'True'       # bool to str

integer conversions
-------------------------------------------------------------
bool(1)           -> True         # int to bool
float(1234567)    -> 1234567.0    # int to float
str(1234567)      -> '1234567'    # int to str

float conversions
-------------------------------------------------------------
bool(1.0)         -> True         # float to bool
int(3.99)         -> 3            # float to int
int(-3.99)        -> -3           # negative float to int
str(3.99)         -> '3.99'       # float to str

string conversions
-------------------------------------------------------------
bool('False')     -> True         # str to bool
int('1234567')    -> 1234567      # str to int
float('1234567')  -> 1234567.0    # str to float

ascii conversions
-------------------------------------------------------------
ord('A')          -> 65           # str to ascii
chr(122)          -> 'z'          # ascii to str

Not all values are compatible. To convert a string to a number type, the string must be all numbers.

ok_to_convert = "987654321"
int(ok_to_convert)
not_ok_to_convert = "abcdefghijklmnopqrstuvwxyz"
# int(not_ok_to_convert) # Value Error

Only the empty string converts to False

print(bool('0'))
print(bool('False'))
print(bool(''))

True
True
False

You can convert '0' to False with a nested operation

print(bool('0'))
print(bool(int('0')))

True
False