Type Casting

We can convert one type value to another type. This conversion is called Typecasting.
The following are various inbuilt functions for type casting.
1. int()
2. float()
3. complex()
4. bool()
5. str()

int()

We can use this function to convert values from other types to int.

Example 1

Python

# float to int

num1 = 123.987
print(int(num1))

Output

PowerShell

Example 2

Python

# bool to int

bol1 = True
bol2 = False

print(int(bol1))
print(int(bol2))

Output

PowerShell

1
0

Example 3

Python

# str to int

str1 = "10"
print(int(str1))

Output

PowerShell

Example 4

Python

# complex to int

com1 = 10 + 5j
print(int(com1))

Output

PowerShell

TypeError: int() argument must be a string, a bytes-like object or a real number, not 'complex'

Example 5

Python

# str to int

str1 = "10.5"
print(int(str1))

str2 = "ten"
print(int(str2))

str3 = "0B1111"
print(int(str3))

Output

PowerShell

# ValueError: invalid literal for int() with base 10: '10.5'
# ValueError: invalid literal for int() with base 10: 'ten'
# ValueError: invalid literal for int() with base 10: '0B1111'

Remark

We can convert from any type to int except complex type.
If we want to convert str type to int type, compulsory str should contain only integral value and should be specified in base-10.

float()

We can use float() function to convert other type values to float type.

Example 1

Python

# int to float

num1 = 10
print(float(num1))

Output

PowerShell

10.0

Example 2

Python

# bool to float

bol1 = True
print(float(bol1))

bol2 = False
print(float(bol2))

Output

PowerShell

1.0
0.0

Example 3

Python

# str to float

str1 = "10"
print(float(str1))

str2 = "10.5"
print(float(str2))

Output

PowerShell

10.0
10.5

Example 4

Python

# complex to float

com1 = 10 + 5j
print(float(com1))

Output

PowerShell

TypeError: float() argument must be a string or a real number, not 'complex'

Example 5

Python

# str to float

str1 = "ten"
print(float(str1))

str2 = "0B1111"
print(float(str2))

Output

PowerShell

# ValueError: could not convert string to float: 'ten'
# ValueError: could not convert string to float: '0B1111'

Remark

We can convert any type value to float type except complex type.
Whenever we are trying to convert str type to float type compulsory str should be either integral or floating point literal and should be specified only in base-10.

complex()

We can use complex() function to convert other types to complex type.

Form-1: complex(x)

We can use this function to convert x into complex number with real part x and imaginary part 0.

Example 1

Python

num1 = 10
print(complex(num1))

num2 = 10.5
print(complex(num2))

bool1 = True
print(complex(bool1))

bool2 = False
print(complex(bool2))

str1 = "10"
print(complex(str1))

str2 = "10.5"
print(complex(str2))

Output

PowerShell

(10+0j)
(10.5+0j)
(1+0j)
0j
(10+0j)
(10.5+0j)

Example 2

Python

str1 = "ten"
print(complex(str1))

Output

PowerShell

ValueError: complex() arg is a malformed string

Form-2: complex(x,y)

We can use this method to convert x and y into complex number such that x will be real part and y will be imaginary part.

Example 1

Python

num1 = 10
num2 = -2
print(complex(num1, num2))

bool1 = True
bool2 = False
print(complex(bool1, bool2))

Output

PowerShell

(10-2j)
(1+0j)

bool()

We can use this function to convert other type values to bool type.

Example 1

Python

# int to bool

num1 = 0
print(bool(num1))

num2 = 1
print(bool(num2))

num3 = 10
print(bool(num3))

Output

PowerShell

False
True
True

Example 2

Python

# float to bool

float1 = 10.5
print(bool(float1))

float2 = 0.178
print(bool(float2))

float3 = 0.0
print(bool(float3))

Output

PowerShell

True
True
False

Example 3

Python

# complex to bool

com1 = 10-2j
print(bool(com1))

com2 = 0+1.5j
print(bool(com2))

com3 = 0+0j
print(bool(com3))

Output

PowerShell

True
True
False

Example 4

Python

# str to bool

str1 = "True"
print(bool(str1))

str2 = "False"
print(bool(str2))

str3 = ""
print(bool(str3))

Output

PowerShell

True
True
False

str()

We can use this method to convert other type values to str type.

Example 1

Python

# int to str

num1 = 10
print(str(num1))

Output

PowerShell

"10"

Example 2

Python

# float to str

float1 = 10.5
print(str(float1))

Output

PowerShell

"10.5"

Example 3

Python

# complex to str

com1 = 10+5j
print(str(com1))

Output

PowerShell

"10+5j"

Example 4

Python

# bool to str

bool1 = True
print(str(bool1))

Output

PowerShell

"True"

Ungraded Questions

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